Malicious PDF — malware analysis report

Static analysis result for SHA-256 375dc4381bb74341…

MALICIOUS

PDF

75.7 KB Created: 2021-06-11 08:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 42ad224583f60d2685f13a6ed559fa05 SHA-1: 437f2af029d5f36cdf9b206e735c94c4034470d4 SHA-256: 375dc4381bb74341b1a5181f6f05f332723fbbd6a7be041e16761e0efec8df72
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a lure related to a workout plan, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://smidgel.ru/uplcv?utm_term=beyond+bigger+leaner+stronger+workout+plan+pdf PDF link annotation
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/bbcdd0bf8a16624191d6eaf0c7e49e02/zibojaxonogirupajogikax.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ee9e61167409af324c7acbfbf6b1589d/95770793730.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914175ad7c1---suluxiralibipanadaru.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/5e9de6c3155903b29460cc1399825b6b/loparokuwezo.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/0b27636eaf1a6cb6ed1c4e589b6cb9ab/vitebevavujonunevos.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/14cd29c515d619c4d8fbf7f64d18f499/piwip.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/rdevltk04r690av6g91uvlae49/44355434895.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bl616hllm0bukbe8hrnflb42g2/32347338920.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/32c557e1af810b444876d9525228da55/sagabazinadevoganu.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160986c53e0c32---63736277141.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a81c9321061---benukuboxekisuro.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/43757893632.pdfPDF link annotation
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/2mu4tkres9uf54k7affiao0dvj/ribemoxu.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/e9flfqc1i9g3v2635j4b7od0r4/fijojipazowalabokijanedu.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813aa759a41---84626533385.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bf184a88d---mumobekir.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/379cc2e3106884d8aa699007fe8fbe8f/47800914993.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11021246f9---tadebizisamixu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE930 5656 bytes
SHA-256: 1f6bff218a9805d80be561f5fb89e8ef7f0a7c53c6e84ab2386ea1f2355bedae
font_01_sfnt_off0000fc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 10748 bytes
SHA-256: 30be1028cde306ffd69568e16ab566894b15a7f4893bead5d895ed03dd27942b

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