Malicious PDF — malware analysis report

Static analysis result for SHA-256 950e3b771fcb7766…

MALICIOUS

PDF

79.0 KB Created: 2021-06-23 14:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b313fe21e700ad0bf5721237b0fc67c5 SHA-1: d51a05c4bd7c8ac446c0a55a49bcebc272afe0d1 SHA-256: 950e3b771fcb7766940814c5aa61ffbec3f515c341ff68f52e2192dc046bdd51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for SEO manipulation or to distribute further malware. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/174596636b8120e498ba2f887bf883f1/30482467906.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/42684d704d7daf84506dca362b974af9/8100028415.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16071eaee262be---gilowamaledekopelufositax.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/liturepatavukosu.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/73396314890.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/jimovejeret.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/13539625997.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608329049d548---42483810877.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0b70f236ca26b86b22221710e945205d/goludakotokivevovekilago.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/nunupexojolewigepuru.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160be505644e64---77263039518.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd00ce6fae---48592046784.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/feb77bb49408933cd938212b9ed18948/70596102966.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/rifoduji.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/67026052380.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2a56df0a---3867169694.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=11th+biology+one+mark+questions+with+answers+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E6 5936 bytes
SHA-256: 69580fdb172468df8426e372351af9f203fb80d9ee9e072145411799879fc9dd
font_01_sfnt_off0000ecfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFB 12060 bytes
SHA-256: 0f190552a9162b5b84c16aeb7116726703b242c2fad9a1b93662abcfc824051e
font_02_sfnt_off00010bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFB 10136 bytes
SHA-256: 4280faa845be29f56b4e6ffee974009526244d0c6db0dc74784ccf7fe89836fe