Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a8b3860a47f6fc…

MALICIOUS

PDF

91.1 KB Created: 2021-08-06 17:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea3f386eb0f3314c0f8a56301cbc6f07 SHA-1: 855f761fd4aa7f5247b94944d3aeebf32dcb1d4e SHA-256: c8a8b3860a47f6fc609e94d98e50e03e8bd2d8778992d3818b1a47274818fe01
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. The heuristics indicate it is a link farm pointing to compromised WordPress sites, likely to host malicious PDFs. The 'SE_CALLBACK_LURE' heuristic suggests the document's content is designed to trick the user into calling a phone number, a common tactic in tech support scams or callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c252176ef25---sanuvapazikirep.pdf In PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e2b5bb2a213---79650761055.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/b72eda753441adacdab95342139fa0c7/64532971491.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160812dae09a56---pilijupidikuvupukijululut.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/levin.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/83536191518.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/56418568212.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/pilobajevezuranuxo.pdfIn PDF document text
    • http://aps-mes.com/files/file/25820497493.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/94133844495.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/3bd470f3d678b2ca5e42b854eb2579a2/dutobi.pdfIn PDF document text
    • http://short-story.ru/upload/file/5100541657.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/2212295511.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/81516925395.pdfIn PDF document text
    • http://envigest.cz/upload/file/dumiwupafofulovu.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071d7e0299c9---75150973462.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/59d6544bc33de322722cc167fefa1315/guwuwosobi.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/menimenupagofuvesapulip.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/pirapanele.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/wodalopuj.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609859d14e134---zudaxapuxajimoxoxo.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609876aa3b84d---88889368361.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/jawopuwezek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+use+dish+hopper+3PDF 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_off0000fe90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE90 17648 bytes
SHA-256: 41c065602a797a0b96f73d5d13ad8c3fa203dce63e26315cecdd07204586e7bf
font_01_sfnt_off00012cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCA 10524 bytes
SHA-256: ff207e662cac6c2abf4ec0d0be4efe1d5e892659f708a1c5730448aafab80e20
font_02_sfnt_off000144f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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