Malicious PDF — malware analysis report

Static analysis result for SHA-256 b669ae16991c75a4…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 17:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1dc181e15f98bfcc003415f81f1b85a5 SHA-1: e3fcd5db2a82b3df8970f3bdfd6a6dd1b55c7a55 SHA-256: b669ae16991c75a4f96a58752c5fa4d9baf5a504580d2c9077433d4960e57381
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document body is heavily obfuscated, but heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number for support or billing issues. The embedded URLs point to compromised CMS upload storage, suggesting a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607214a58ae27---wanineporiwimuruk.pdf In PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/ed1e6c272b7108571c2cc0d4b3ee4b21/37467399406.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/15654817599.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612de30396edd---72221152786.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a8558b090be---molikolegipuxarizijeret.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/kirafujejalu.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/82f5b34e70e79f95c167a5a779e9e334/79359302454.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610c4dcd88506---4347611118.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16252634242573.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/20454190498.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/58759367628.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/xurakez.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/74362525027.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/68005966894.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/6573c3897a115fcdfd2606f8241605ff/monekesutufekolujapod.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/60161703863.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/0281999f0fbb041591fcdb0c727e5245/23130132064.pdfIn PDF document text
    • https://susta.vn/userfiles/file/73360849221.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/35761493929.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/du6r9h670vmng5ron3lf3pnr92/33486678577.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/56440294975.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///10803680007.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/52655480265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=biologia+de+campbell+7ma+edicion+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_off0000d4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 10840 bytes
SHA-256: 8256d022598ff83efcaa376fcddddfd19c32677fe62541c4d738a25ccdfcb415
font_02_sfnt_off00010561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10561 19512 bytes
SHA-256: 7584240fb740d4a6c2ca86168b89dca2e3c8612fc1b00c54a14a398dbb877167

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