Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf6fd3fe205b86c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 16:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: db7a1ba3d62673833f611837b7d15bea SHA-1: fb93813cd675fba975643d5d652699817bb8800b SHA-256: bdf6fd3fe205b86cc4f7673ef8150072c548dd57283de05b8aa0ed793bba410a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress upload storage and disposable hosting, suggesting it's part of a link farm or phishing campaign. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech-support scams or callback phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.
  • 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://bustotoronto.com/userfiles/file/10199519155.pdf In PDF document text
    • http://hondasushi.com/uploads/files/xukadabik.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/tifep.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/vuminowimagaxaxepogup.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/wowokuvamig.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/62428687663.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__613165D02187B.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/55820642904.pdfIn PDF document text
    • http://aquinasnb68.com/clients/9/9b/9b9a52ed12f3b440fa02b6ce64642487/File/pemozobizometigirunuwawi.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/kanorojusinaviganubebawud.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210822104406_1330750520.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/newusu.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/90986368083.pdfIn PDF document text
    • http://zcapitalcrm.com/app/webroot/uploads/files/xiweke.pdfIn PDF document text
    • http://edgecs.net/documents/42182623425.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/xowumawavuwuwop.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607df75b5edbc---gufawupedoguxize.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/zedukasutosar.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/81183415679.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/cr3emdhv26grjpc9kr09edql23/wofopazakavu.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/72f281ecdb17136e9d06fed8ca536bc6/zuxuxinuwewelusijusatef.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/74e4bb653b13e643212d40f6fb910d77/muxamufitatedexino.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/2882034064.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/jedusigudij.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/28331469597.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/negezifof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=geometry+worksheets+pdf+grade+8PDF 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_off0000d9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AA 11240 bytes
SHA-256: 9806ff57024e4dcb694bc8cfb3f867bd1e62eeea52338e0d3ec770dadc3ec026
font_01_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 17280 bytes
SHA-256: 4c00c611b2555cce17bb2065f9e10922b69adcba5c58edc3714da9aba94f1a33
font_02_sfnt_off000120eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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