Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf954edbe9a80b8e…

MALICIOUS

PDF

76.8 KB Created: 2021-09-05 10:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5d103a0830be995b80298398d57d1819 SHA-1: d6687330fa8292bc234d4f8f0840f19a734a2673 SHA-256: bf954edbe9a80b8e20dda4df1d896bd44e5b7c42fd28b82d991edc1872c6ab9f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous disposable domains and compromised WordPress uploads, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=suzuki+dual+binnacle+control+box+manual PDF link annotation
    • http://megaprestige.ru/uploads/files/gisawudinamudibawuna.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/46160039302.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e338d868fce---60654519063.pdfIn PDF document text
    • http://northjerseyseniormenssoftballleague.com/clients/2/22/22e10641a135963e7b476298ec508c3c/File/92029714882.pdfIn PDF document text
    • https://airbays.com/userfiles/file/69460328798.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/qu6anvd4o7ac6qf2iohvq792l0/33052604051.pdfIn PDF document text
    • http://heizler.hu/files/file/nivigabajetiz.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/xoniwojegenefogumuv.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/53011011085.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/43cc9fe0ca594ca1a9eccacbdc410a6c/99992464795.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/63834315556.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d67bd8d9d20---45726930724.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/22695762019.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/petibaw.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160739bb5c35f9---12925339904.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1610798585b5bb---gewavujafizejuzo.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210730_E498A1B490C742D0.pdfIn PDF document text
    • http://computerdoki.hu/user/file/68573027098.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/99576209342.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/nelinilavesawi.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/20260957752.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_off0000c7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F3 10932 bytes
SHA-256: c6abb6b9197a7a10aa8fd0e10868c9595b46e342a29041eea2c8eeb7add24a32
font_01_sfnt_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96A 17224 bytes
SHA-256: 5540335fe9eca3adf4ce2d4d982f38eb98a6cb4ed3da8002eb2d759c9ac3dac1