Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd8a3ad597d44a6…

MALICIOUS

PDF

84.7 KB Created: 2021-09-12 10:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d0cc3922d28bff3e2fd71c3bc50c3a06 SHA-1: 0197297dbc534377c24d925febf7740d5a4947ec SHA-256: dbd8a3ad597d44a6c9da11616bcb8dc43edf933d2070f6a950f67d770da9587c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, forming a link farm. Heuristics indicate this is a common tactic for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns strongly suggest malicious intent, likely to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://keacg.com/upload/files/20386349091.pdf In PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d33309a1c4---nudibaxidopa.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/xawavotufeju.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/29272d8653b1be11bd50aecc7167473e/94851555116.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138745a40d9b---jowogoxojebadenanonupe.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/xujukafufewolipatozovogu.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jujufogewadiwomo.pdfIn PDF document text
    • http://acril.ru/ufiles/files/74882112699.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/xopapuvibe.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/fuduz.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/ruwuvifoxizojiza.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/9929899789.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/14347965020.pdfIn PDF document text
    • http://uteambio.com/upload/files/valomikonimanirawiw.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/jetisonububedozoweja.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/14679670598.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/nubolijaxotoba.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/28490689513.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/rozagirujizusolosel.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/30753743538.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/vaduwogam.pdfIn PDF document text
    • https://foulardfotografando.it/file/84589828448.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/16396260725.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/99596518194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=lightsaber+combat+stylesPDF 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_off0000e73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF53 10784 bytes
SHA-256: e53e9b4f0982fc42d6dcb627d1c95ed6490aeb1bc23262156b4fbac9fc096ff6
font_02_sfnt_off00011832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11832 17596 bytes
SHA-256: 6c248076dd268fe54c04fc2a429621c87834d5c5bd2c63404e3a3889d4f8f5bb

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