Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ff06cf29965e7a…

MALICIOUS

PDF

87.2 KB Created: 2021-09-21 17:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4233907869bf7f0d8668e2150da84614 SHA-1: 06c17e4cd01b3c13c8e0b16242297d3dac5bce51 SHA-256: b4ff06cf29965e7a838e6648de0dee166ee3bd088819409e107391c82f8232c7
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6163fe1aeb34a8331c2315711b8fd79f/97844896689.pdf In PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/ladikaja.pdfIn PDF document text
    • https://paperland.bg/uploads/file/kixor.pdfIn PDF document text
    • http://w-mill.jp/images/file/62114219899.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/69211593002.pdfIn PDF document text
    • https://miet.hu/kepek/vegojubefeluwedinajewed.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/85772259049.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/tesokusozatedi.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/fifovizi.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/nuxaneguwigufojo.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/45509226448.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16136cf0ab72d6---buvegotozolikibajirezorex.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/67032240612.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/74fe19fec9cd05d8c244a0109923ce18/nigovatidug.pdfIn PDF document text
    • http://freestyler.cz/img/file/49939383635.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/tevijasumemaralevejogew.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/zomoboxexenefurid.pdfIn PDF document text
    • http://htwy.com/upload/file/69818949414.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/21624531381.pdfIn PDF document text
    • https://wrd13.com/force/file/fexafejajagegowumopagofa.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/19925807830.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/xobir.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f38ed208205af75911f298315629dc19/79989337300.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/96870007814.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/dazagen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=wattpad+iphone+apkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 10260 bytes
SHA-256: b788cee40f9537dcb887cac9ffcc3e3458f7b82e58a85967d0ae4afa6946ad26
font_01_sfnt_off000107e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 18476 bytes
SHA-256: aa4299315b66acab0c24779ff10e1193833118d6607d9f9a9f5e43fd1092c391
font_02_sfnt_off00013762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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