Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85d9421f622c304…

MALICIOUS

PDF

70.5 KB Created: 2021-10-01 22:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3a2b21d803980a78288d40b76ac18b1b SHA-1: cff21a7e31dbf3c48a8b4ee7c00fac68126f7dc0 SHA-256: d85d9421f622c304f818ff0087a8b8b1c93b07dfe47b8bbfd68e07e47ed1864c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links, many of which are hosted on compromised WordPress sites and point to other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of external URIs and link farms suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://laborke.ru/uplcv?utm_term=youtube+play+music+mod+apk PDF link annotation
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c64bbc357e---zujotekesosewuwi.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/27378306596.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fcb76de877---wekatinipog.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/89445993281.pdfIn PDF document text
    • http://skisun.it/userfiles/files/34914710927.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/1617951096.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a3a1921f6---lugizotorimusofexute.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/nisuzotalafebanele.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/27540682535.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/gajijobulipi.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/tigarumefatobifaxin.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/varipawaja.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/zixepewolofo.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/zawovetim.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/14379194385.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/tavugowegilun.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/toliragal.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/68386967927.pdfIn PDF document text
    • https://rajakedua.com/contents/files/33504322907.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/bubosanoseboxawivoxejapak.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/devidilirisixuk.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1e87067dd49e6239647b8b3ef86bfd20/vepewisekexalerag.pdfIn PDF document text
    • http://jfe.hk/userfiles/80171803808.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/werupozisivud.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/dokevu.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_off0000b288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB288 15436 bytes
SHA-256: d5ff763cb2488085485a9668d5174b68d63fccdbac11a793b5cb67155a1a0108
font_01_sfnt_off0000d98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98D 10900 bytes
SHA-256: dbdf7e0fb6ac88c89461e46225155a6d74a5afb58c55b60b79e38756e723fb8e
font_02_sfnt_off0000f2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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