Malicious PDF — malware analysis report

Static analysis result for SHA-256 739024c0a2f94fdf…

MALICIOUS

PDF

76.9 KB Created: 2021-10-06 07:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3e4400551132166ecda747c25f0abebb SHA-1: a3a56a62b18698565a1ea86eec95d7218a946413 SHA-256: 739024c0a2f94fdfaf4238c2acb87855d52cc15a92f0bc2626d24147246cc15f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it is a link farm pointing to compromised websites. The PDF contains numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://krisoc.ru/uplcv?utm_term=convert+to+word+from+pdf+free PDF link annotation
    • http://alpha-cp.com/userfiles/file/55516535815.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/xedilugukemafevigi.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/zibakefagubijikosavofog.pdfIn PDF document text
    • https://pedrazzini-legal.ch/UserFiles/File/9120145170.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/50977099173.pdfIn PDF document text
    • https://ms02bet.net/contents/files/ramudaxoga.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/fubanokoguj.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/24643622079.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/xezasokevabo.pdfIn PDF document text
    • https://esvigo.com/upload/files/vitakigikezeselumofam.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/nutejuxixurajirevofoj.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/kumutelana.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/kotitedukov.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/modoferepegogif.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210914120034.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479a3ae2d98---fitavagimipojaniwomozowi.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/7354cca8139b350a343a9a602919006b/gotume.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159061a05421---89337660177.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/pupamuzotuxosabipaguseme.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/20858235580.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/vurizolanuturijevamute.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/veguvonufi.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/dofoku.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/39041490093.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161429d00d6b5f---miminerewemipalarisut.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/nivikaxeleledimufuzepot.pdfIn PDF document text
    • http://homeopathyhk.com/files/semegegagakaveruli.pdfIn 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://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_off0000cc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5A 16276 bytes
SHA-256: 2390f4d9d4b00a0537a49a1df383b02a9ad65f4083284c846893563f8d33a041
font_01_sfnt_off0000f68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA1 10376 bytes
SHA-256: fe78a17a655ca03f261936a7d4dda1a1e16d041ca4e207ce9bfc95b91d5d840b

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