Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d78652e1acc3645…

MALICIOUS

PDF

86.0 KB Created: 2021-07-07 12:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24397e12eea0444e3e377fb946e945ef SHA-1: 4487a7b1c2113a868edbfb22b713d4f82a5a18a5 SHA-256: 6d78652e1acc364577a7ba1a027e10ce41897d5266a67636cbe82e7874daeb48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://billsky.ee/files/file/15152176127.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b453009fd9f---27920013136.pdf
    • http://veronikavilla.hu/userfiles/file/gupemegubo.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075dabd1450c---78802637495.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9845e8342---83894718264.pdf
    • http://dnepropress.net/files/file/fotixoxowozojudesufoduj.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/5d7a7e598a50a6a7ad6a00177a3873c3/54639895872.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/36781956685.pdf
    • http://szkolka-wiercioch.pl/files/file/86815066172.pdf
    • https://aiwatopup.com/ckfinder/userfiles/files/legemipubakimevudajo.pdf
    • http://domeinbeverdonk.be/assets/files/file/80805533269.pdf
    • https://actorconseil.com/files/file/wijujekeg.pdf
    • http://say-international.eu/userfiles/file/xakogu.pdf
    • https://rybczewice.pl/userfiles/file/salixa.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hd5krj9ffh64dkdjhlko21pfs3/degidomazupu.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b865f65b8f1---xewojapudimorazonikil.pdf
    • https://fobh.net/userfiles/files/66447088013.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbf4058915---jedebejozi.pdf
    • https://zoldlepes.hu/userfiles/file/zivabitulisa.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160807347a650c---gudenutizab.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/2894bcb11813d35bc145a3b9413e9a30/15845682992.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f3bdc5149fbc9d88fe27a76a55a06ba0/92337754146.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=a+body+and+mind
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BE 16792 bytes
font_01_sfnt_off000108d0.bin
0b853e453be079b2ab6936ba6f3f569bfe6308a4c86842f37dc2e0c846975bec
pdf-font-stream PDF embedded font (sfnt) at offset 0x108D0 16928 bytes
font_02_sfnt_off000134cf.bin
d8702325d702e00eff7e234b7d1399baa3d780666c5342ac52cc8a9a5d7669f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x134CF 10100 bytes