Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf56ddf30df83a2…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 22:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c6caefa068a0ff7786ee3437d62365f4 SHA-1: 07489a90d7acfc3523f3e2e1d33816335c8ac1fe SHA-256: 5cf56ddf30df83a27347851426c5f2d0e6b97ab718fd946af68640207b817ee7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as disposable hosting or potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to lure users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 http://ruizhishengwu.com/uploadfiles/file/111159597154.pdf In PDF document text
    • http://chizclean.ru/files/fck/file/5023196509.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/ziwexibuje.pdfIn PDF document text
    • http://vhktn.at/images/content/files/70359249951.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/81316517275.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/wejozitadisugal.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/52094505874.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/24296380717.pdfIn PDF document text
    • https://sopkambing.com/contents/files/91421763222.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210926164803.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/26019882222.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/72191603364.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/42049853283.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/lefipezisi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rtbtargibvclfbarof8tofrj82/56856045675.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143da23620a3---91772237037.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/60561984462.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/93189583754.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/bazubavulolulizisunibi.pdfIn PDF document text
    • http://moretonassets.net/userfiles/sasagoguronawukuvewugap.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/xerepapuxovapokuberibo.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-24/20210924061113851975.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/kutupasesisekup.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148ad3aa7981---zinilezopamisosanaf.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135388b611d0---73216705876.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/44401837576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=chemistry+electron+configuration+chartPDF 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_off0000b248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB248 11028 bytes
SHA-256: 04d9ce94b28b20b678aedacc95ff82ac5691516ae215eca1807941412732554b
font_01_sfnt_off0000cbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD0 15892 bytes
SHA-256: 29004d5919756074205e66eaa5cfef9539059ddd9f883aac093e59b9fd2429f7
font_02_sfnt_off0000f4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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