Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80b1c931ab6aa4a…

MALICIOUS

PDF

185.0 KB Created: 2021-07-24 11:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 13d3978fd0d9ef0afeccc26cbd3f2e4c SHA-1: 845bb240082bd8a8eb9416cf6e70a29faf0a2383 SHA-256: b80b1c931ab6aa4abc59d5b94893f56fa67bbdf17321768c2deb6c2d63136563
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1598.003 URL/Domain Reputation Block

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains a link farm and impersonates Facebook, likely to trick users into providing credentials. The document body is heavily obfuscated and unreadable, but the heuristics suggest a credential phishing lure with an urgency component.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9505

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bloons+td+6+free+steam+code.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://terminsk.by/pics/files/38469181644.pdf In PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c477bcd5507---lagodikixigakutame.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1d0062288---22432216251.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/0mcrdjrmulslb8ui8i1v0ebmd9/61470973472.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c6e8614d---fudamilug.pdfIn PDF document text
    • http://unseretochter.com/images/file/radiro.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/2c1ddbb5f21f6b09143cc0496e80fc9a/33835545884.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16087d1be6655d---20999970128.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/gusopafidiperusenek.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0647ade2fd---suguxe.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c36b0d782b4---nelomi.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/sonogevizinukilidufofive.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/49563104131.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/6ae9nqcvgv57i12uq8c43o4s17/kipuduxijasutep.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/5182162431.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/misememaxosesubabawim.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/tudixiniwaragulekolak.pdfIn PDF document text
    • https://scalper.ir/data/files/file/12443074363.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/05e06d64627f24111fad78006be65f17/rivukoxis.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/622126b5a4e6d4bb6295cdf9fe60f574/98860621777.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3866f08dd---85750286030.pdfIn PDF document text
    • http://stringpoets.com/userfiles/file/xovikonajabewusugitut.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/xubufuje.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/93917792f72b5e81b7d9dc905e3c9bd1/62993083994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bloons+td+6+free+steam+codePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000254f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x254F2 16120 bytes
SHA-256: 5cfa37fce0989fcd98349beccf9a63719aff29e66b00f3ba655f54b68a91f5d5
font_01_sfnt_off00026a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26A46 10768 bytes
SHA-256: aeef4b1fedf22763a989e900e19b7a180ce727875523b4a2e0c1b82053846af9
font_02_sfnt_off00028316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28316 1696 bytes
SHA-256: 0a4f45ca35490f1796084ea6d97ca1a4a36387197472668db154df97085ea45b
font_03_sfnt_off00028b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28B30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0002a342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A342 18460 bytes
SHA-256: d269e3054d94338f0a99965f2a8e1c826d5205347f23e762736d3493c639f2aa

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