Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb3fd296ee5a3c0…

MALICIOUS

PDF

114.1 KB Created: 2021-07-01 12:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c0495995620ac0f44daf2651049639e9 SHA-1: cef0f1da3ddf7470f3a28c1ee1ce55955340d68b SHA-256: 4fb3fd296ee5a3c09e30d6922f7a30a5ce145b071c8b1eec7f8ccddad3020d8c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier. Heuristics indicate it contains a link farm pointing to compromised WordPress uploads and a callback phishing lure, suggesting an attempt to deceive users into contacting malicious actors. No scripts were extracted, but the presence of embedded URLs and the phishing lure strongly indicate a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb80e35159---nabasatadezebaxefare.pdf In PDF document text
    • https://homestayhoian.vn/uploads/image/files/90450837761.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1871940455---2640544123.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/d5460ef42ef68ad49723ad9595e5f19d/60807995602.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/46009126901.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af74c4cbc8---kumafivavipotevu.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5966b9393e---mubimojojovuv.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/76977343876.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/91492689154.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd4c56b91b---vuduzivij.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/6io8ge5v2168adjtjq7gmmcgmf/xuxalaxulejokuz.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ef3424969---86986591883.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/4fc25fa2eab341a139d2ef0fce05d329/76365919481.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b6edcc2df6e---23223195719.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/a793e65a17e0a83c58b489077766300f/87468486625.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc69ca5b43---97575343027.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16089b38144664---dibeguvuwuwe.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df9a39f699---povupuredatajavaxum.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec43fa89ba---36522190592.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/wetarutasukawi.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/d1e4f37d94c56199529cf9e8dbe22aa3/fumibuxijimuxalewunepop.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beff595564e---kiruvigedinow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=on+a+certain+blindness+in+human+beings+pdfPDF 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_off00015bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000173d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173D0 17532 bytes
SHA-256: b506c8e67f4bcb650a9f93fc25c11f0100f09ec861a8478fcec830ff7ca269c1
font_02_sfnt_off0001a13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A13E 11212 bytes
SHA-256: abd5325f044de629ad36c9b4641904df3ebe7b9e86124e41caa570a1020cd436

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