Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3166a4bd59b42a…

MALICIOUS

PDF

84.8 KB Created: 2021-09-12 19:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2502499bd52bafb1405ddf0074e8272c SHA-1: c8765d8d631715cb693a7d720408c547945f5a4e SHA-256: 8f3166a4bd59b42ae9ffa30c4851a2854ca123b958b5dfbd278cfd8cf68f9a0b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of PDF link farm heuristics and embedded URLs pointing to various PDF files suggests an attempt to distribute malware or phish users. The 'SE_DOWNLOAD_BUTTON' and 'SE_CALLBACK_LURE' heuristics further support a social engineering attack pattern, likely aiming to trick users into downloading a payload or engaging with a scammer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/89dcafdf7214a92f68a0b3122b7736a0/25957254208.pdf In PDF document text
    • http://belly.bpv.su/content/files/files/64042821953.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c700bbb64---30445357808.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/86490784087.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210911094616.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/xepilibeguwulowi.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/58730293381.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/59693594589.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/24286223201.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/tolugozeroxo.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1631349908.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/newunukakafasolux.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/22061441971.pdfIn PDF document text
    • http://ustunongel.com/image/files/lifozosabineko.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/17433644989.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/fepakenawadanogol.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/78018906238.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/27516876161.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/xejobugusovezuxemiluziwel.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/3286890843.pdfIn PDF document text
    • http://zzquansu.cn/d/files/97683535689.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaeb3cfe07---pedarudomelelabuzarimumo.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/3311c5f2de62e6ee68078fbc42310bec/37821837017.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/laxiwatibolirijaso.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/44068790322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=dream+league+soccer+2015+obb+downloadPDF 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_off0000dae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE3 21732 bytes
SHA-256: 8fe6d5b5b775d57dcd51690862f1808cc9d6243b2b0bde3fc1a65ae12d8a76ff
font_01_sfnt_off00011323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11323 11276 bytes
SHA-256: 3a6613270f45862d1260a74a4b96e0dd2b56c558153f778261388129e728fc43
font_02_sfnt_off00012d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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