Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb5106ba5583c1f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 04:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 16da2f38ea69241848782ebd0dd5d22e SHA-1: 1ef0be0db5657d15c0103aae08fd17a59de2d72a SHA-256: 2cb5106ba5583c1f7855b3a9829a64ee42166fe03930517d19ead4b1defd8f25
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous external URIs pointing to various domains, some of which are hosted on compromised CMS upload storage. The document body is unreadable, but the presence of multiple links suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=smallest+atomic+radius+in+periodic+table PDF link annotation
    • https://haidangpc.com/contents/files/74058058060.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/kuwalefegikofobugolagu.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/74188280583.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/junuwusivo.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/kejol.pdfIn PDF document text
    • http://napiarsaigh.com/images/92211223224.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/0b27e732fd23f30a6834954da39add85/rixosevirafexuworopade.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/mabijikafugaketet.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/465723c3976df4b421876d1a2dbda488/41836607093.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/mukopenatuxeriwikiletug.pdfIn PDF document text
    • http://batistar.fr/userfiles/file/jidup.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/73189388768.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613543c52ae39---74413504893.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/zokugerejomazipebeg.pdfIn PDF document text
    • https://thietbigas.net/media/files/82241871367.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/77395560792.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/77700438561.pdfIn PDF document text
    • http://profstil.az/userfiles/file/pezapuwetelujevujidipix.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/gusig.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/jewubimuwegajajajijamiw.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/wofejumetomonuw.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/4p4rl1dqcgcbqhnr28b8el1rts/93050555544.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/9834305833.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_off0000d972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD972 10992 bytes
SHA-256: 2b5b59e91e71733f0a41c35e2485871442d864fa4e2a190cb3c97f321e379664
font_01_sfnt_off0000f2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A7 16224 bytes
SHA-256: 4d690cfcbb3455be761d550bb7c516f4c19d93b8e96c1ba9de952c7011187bd7
font_02_sfnt_off00011c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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