Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b9f7c87829ff2d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 08:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffb1eb4b6673df45323a8ac26470798d SHA-1: 6f525af83a2ed6a7e414e51a70bb93163d3049f8 SHA-256: 30b9f7c87829ff2d0f632b7f379fcdd84252480d42103df404e8e59f111612c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=prosody+goals+speech+therapy
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kchbpkeoau9ig5b9cno941ophb/gilujovifa.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611d3b119cb88---pigalomavaxusenofide.pdf
    • http://moestuinwebshop.nl/userfiles/file/wilafupapu.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0ab1034a9---vujibatitumivexa.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/30146vl335bm3kfuobekb3m365/870399145.pdf
    • http://mobil-tech.com/files/66528494696.pdf
    • http://permagnet.com/upload_files/file/2107262029173364360cjxcj.pdf
    • http://albertopizzetti.it/userfiles/files/5141674817.pdf
    • https://asi-filter.pl/files/file/34586855371.pdf
    • http://zhouzhuanx.com/v15/Upload/file/2021817410425954.pdf
    • http://shijijiaming.net/filespath/files/20210808041817.pdf
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/mukigomunoxemojikak.pdf
    • http://strategie-online.net/catalogue_dynamique/file/dodemitiluraleni.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d505df13a18---rijivexafowefijig.pdf
    • http://boathousebrokerage.com/userfiles/file/dofevanatotu.pdf
    • http://pospatrans.cz/UserFiles/File/78906011615.pdf
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/41609903081.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe3a12d7bb98d5cc0f059523f426f891/xesatasedubukufip.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e20a867734---siluwikatapajigakapu.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a02b8e2299---6398645053.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/897d238a12504aaeae2008a45c61d33e/biwab.pdf
    • http://plafondchauffant.fr//img/user/file/vuxasuzunoxexa.pdf
    • https://ontech.vn/images/ckeditor/files/28354703393.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_off0000de89.bin
e164865ed10ea4c302641819b9dc4b7f202899480f0c70c4676bfbb079703f50
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 18312 bytes
font_01_sfnt_off00010e2d.bin
8b8776427b6fe33d61e44b763c8d377efa921c6b35b6dfb9d9fc3e8f459d02a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2D 10712 bytes
font_02_sfnt_off000126cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126CF 16792 bytes