Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52b212a51cafe20…

MALICIOUS

PDF

83.3 KB Created: 2021-08-18 15:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 743d6d5535da40f1a173c943efeec06e SHA-1: a1153edbd12525b2304b806f07e945536d1e7bb6 SHA-256: a52b212a51cafe2064909a6abf8ee86ad9757e4fcc442429ed06fbebb4663226
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous URLs pointing to compromised WordPress sites, likely serving as a link farm to phishing or malware distribution sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, further suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://crewmak.ru/uplcv?utm_term=how+to+use+first+response+early+pregnancy+test
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/99e52353f391180806838794df6b158e/kimezerufefam.pdf
    • https://gites-les-bardots.com/userfiles/file/tavotepadidosati.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/f959fa2bc91ef883af171ae146b6d490/gudutosedipiberiminogifo.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cba0cf68a1a---54374514933.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/90a99e345bcdf8e38e27696eb1a1ccd9/43413233622.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f951e8b2e31---rofofipekarebif.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/h1dbvle3i8s8v94ronn7ldv7g0/rizozufipodusovifebiga.pdf
    • http://garantc.ru/userfiles/file/94940784128.pdf
    • http://studio-rivetti.it/userfiles/files/jofubovumegawapaziloxav.pdf
    • http://dolphinegypt.net/userfiles/file/68269950744.pdf
    • http://danies.ru/ckfinder/userfiles/files/fifazukagizeb.pdf
    • https://oncetrabzon.com/resimler/files/3090973648.pdf
    • http://crosswaysrecruitment.com/userfiles/file/zodasewezunamevepuz.pdf
    • https://tennis94.fr/img/pics/files/bofuzizusa.pdf
    • https://nvsrolko.org/ckfinder/userfiles/files/girarutinemumumunuj.pdf
    • http://bpabv.nl/uploadfiles/file/xadivekubedasawivezipetow.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/72967caace0d3afa5062000196f33ea9/22439246409.pdf
    • http://boatmonies.com/uploads/files/55010446526.pdf
    • http://theheavent.com/userfiles/files/vavibumus.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/6b5d6caea2cb19deab536f24b5ac8039/putufirelemifabuteve.pdf
    • https://marblo.ph/app/webroot/img/files/vawobexirofadelop.pdf
    • 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_off0000e2f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F6 16792 bytes
font_01_sfnt_off0000fb0d.bin
38860f575e07968c2e9eeacdf62a34834c00e7fe2c2317be0d8c29534b251d18
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0D 10944 bytes
font_02_sfnt_off000114a4.bin
5630bda448bcf66b7f76a1fbc4901440181cf64622976129c74cc2899b0c85b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x114A4 16544 bytes