Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3074d28358c19b…

MALICIOUS

PDF

116.8 KB Created: 2021-06-26 23:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b17daf7a0d41e1918590ade2b7b69642 SHA-1: 3d65df590f803a61d12a3602d8ef19b0432aca8d SHA-256: 1a3074d28358c19bf9f26fd2c3fa37df4121fd8bb5c7117ab1702ebd27e99c88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, rather than user-facing text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edf464676c---fupemulijed.pdf In PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a075d69be---90026370505.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/9f2tdl5jn1dbu2l3aml8r73m93/xuvokunebovesopofolazifuj.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/68120107190.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/31d5218c0ba397f03689a5e655697963/29813559397.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/74811436402.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/10669036558.pdfIn PDF document text
    • http://usmleworkout.com/files/file/mumufasiwibamenoditovenuv.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609034e3d1306---81613128895.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc522c04a22---27692112480.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/bdcd1c29d70a3192e69c6421179320ad/56956393604.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/bigajusazitadu.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a358f2311---78359605505.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/36892262256.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/mafikerisavovixek.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/sutazujixisigamoxinavir.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/7506090460.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa042dda55---15777764435.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/70721041828.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbe017d465---5407295588.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b67f9956685eebc3103cf92c3fa5155f/lalila.pdfIn PDF document text
    • http://slsnn.ru/content/files/67196552227.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/42533485268.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/wepajuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=fire+emblem+heroes+unlimited+orbsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000151c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151C8 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off0001670e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1670E 10568 bytes
SHA-256: 643ea453e81a178cdebe77b2aa30fae1665cf4b13e2657988b6b0b23b236891f
font_02_sfnt_off00017eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000196fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196FC 17644 bytes
SHA-256: a88d9ad505bed0fb1757b4aeaa5c414a2ca96bb21b846072f361727a00454f43

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