Malicious PDF — malware analysis report

Static analysis result for SHA-256 8573932d46d0e6de…

MALICIOUS

PDF

75.4 KB Created: 2021-09-01 00:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 250d24b7a52f714880aa13a58d390d3d SHA-1: 198632663d6e4ea6352bf3df7318a018ca09be60 SHA-256: 8573932d46d0e6de99bd73d689316ac3f2c34b9d5e3f7ac91cf699f8b7bbae73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains an exploit. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or credential harvesting attempt. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the idea that this document is part of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://newat.ru/wp-content/plugins/super-forms/uploads/php/files/85b84cb6011411e78247dcb95f0b6a8f/temibijokumeludi.pdf In PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/huucasr9lv6jds6077e6tjh1tg/18757727875.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/67669265137.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/qc8m1ks2q2dd11t3hm9unrmm55/gadiwukupiretopawa.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/63203904130.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a90bfa2cd8---dinubotejarimodulose.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/guseziwudo.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c2a232eda---40516916801.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/suxixejaziwetikonowavu.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fe3d5d1ec---78951403814.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8ecc39296---fexasamovunoxileropej.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/34860552969.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/05248d9e879395a0168d73f5332e623d/71358304079.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/nanojulatimujex.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/ff056e8a240e5771cdbc68168472e8fd/13321518759.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/76756349608.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9e98669e8---jazijon.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/73230575108.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/98448135762.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/39547281824.pdfIn PDF document text
    • https://kaimano.it/file/21695714034.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/9423230311.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-7/file/tetabekupesimomidatogasos.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/juwuxegafupevupinisopo.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f99742368a---93042172753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mini+tools+partition+wizard+12+serialPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50F 10696 bytes
SHA-256: 495a3a6c1fec59e31cc6723f74c4020cab96a063d12b6415764b64971c943e95
font_01_sfnt_off0000dded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FF 16324 bytes
SHA-256: 6efb233660053e20efd4bb519bc014693f6c74a490c301718f7d8cb6800c3ee7

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