Malicious PDF — malware analysis report

Static analysis result for SHA-256 28aa47bd18c56734…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 20:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5dfa5708b8aeea3a38c8401893f7dfb7 SHA-1: a9d5dc456e28a9cf72e17cdbb8e7db1a74afd64e SHA-256: 28aa47bd18c567340e17cee2a99e3b8b6d7743d89022e70f88fc7298415d4c5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

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://crewmak.ru/uplcv?utm_term=trading+company+profile+template+pdf PDF link annotation
    • http://mamaskitchenorder.com/uploads/files/25481300834.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/xajafe.pdfIn PDF document text
    • http://signauction.net/userfiles/file/65709080213.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/6p9be7ch5dtnac6721t2rrvao5/letitamofewezibiwulawep.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/1791399990.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/63806412806.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/36169926464.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/ralekozam.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/fubujetomigiloxagod.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af0f9a4a784---tirimomoxo.pdfIn PDF document text
    • http://chapelguild.com/images/usr/48492441615.pdfIn PDF document text
    • http://capableapp.com/uploads/files/85298174096.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df0b0387d3c---99334599194.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/todulubudewogujibom.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087706ea778e---98890251875.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/bemeto.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da7dd04734---nunakitafowivivobid.pdfIn PDF document text
    • http://eva.am/files/17c4834202858db1.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/wagojebezezudepeta.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/97869706927.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/xiwekusurolanufixemif.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/lonefifepadiguneraz.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/74714360417.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC9 10872 bytes
SHA-256: 5686fbb898844b24a062d8e51ac7657644664c92258462acdf5752d5c82ff537
font_01_sfnt_off0000f8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AC 16960 bytes
SHA-256: 2a93a6df63e22e414161510c01b9a72eb4a058ab5cfbcc47aece4411ce56467a
font_02_sfnt_off0001251b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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