Malicious PDF — malware analysis report

Static analysis result for SHA-256 852c4e5042b39e58…

MALICIOUS

PDF

85.6 KB Created: 2021-07-03 11:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22bc7c9584bddf07bf220b107ef7ae72 SHA-1: 5997e3238f4ef0b0898e961055701ef19f6bbe02 SHA-256: 852c4e5042b39e586e9c6a2f41f16ef7bfafb7b4a4852c55e5738253e1ba13d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the structure suggests a link farm designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa872c63f---maxizinapekexo.pdf
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/sof6a2p17pbgbvrs8kl40vf35l/93434403042.pdf
    • http://dzbnf.com/upload/file///kitereg.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/82676508541.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/c814ba15c8334c8003abea8e37504415/11178788186.pdf
    • https://nmcs.ca/userfiles/files/9507205145.pdf
    • http://heldermusic.nl/ckfinder/userfiles/files/kudutosomet.pdf
    • https://moscowfashion.net/content/xuploadimages/file/26352736943.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c954d7ed234---totanifodomorerasobunoza.pdf
    • http://avanti-kuhni.ru/upload/files/63332887592.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/67dfc4b2c72ae3e42e89982daba44d10/tutelujeduberijinize.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878dd9b7091---33879152780.pdf
    • http://apluskleaning.com/admin/images/file/30983947096.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/98623557322.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/qn2uijjie114lfddh4e8h3t86i/70556038995.pdf
    • https://inverpalmas.com/aym_image/files/81116988689.pdf
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/83566083044.pdf
    • http://dolphinegypt.net/userfiles/file/65134409636.pdf
    • http://bmcnx.com/userfiles/file/72657957707.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/f58acb196ae39491aabbab3dbeceeef3/94950370694.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607afc8d3604c---tomuropevafikinopewafoto.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/7537eecf62a70f18658cb38cf1343a54/fudare.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=upper+and+lower+body+workout
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eba1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA1 16792 bytes
font_01_sfnt_off000103b8.bin
704c101a56b3fc48d51e8fa356772d85ce06f18977a244b15db0bd6d26f997ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x103B8 10664 bytes
font_02_sfnt_off00011c15.bin
04d22bd60d5bbb2604f648ce103a0fb585e52445a20a545c1a437481f65be786
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C15 17232 bytes