Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3d9fffd1e80aee…

MALICIOUS

PDF

95.8 KB Created: 2021-07-27 07:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 86cf412325b1bb15626ea29befab9216 SHA-1: 1353ca0c14cd62a95418a3985ceee38b4de74363 SHA-256: 1f3d9fffd1e80aee345e3f2c4bc1e15eb872cb7008acd1bdcfa809fdc92a9b38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary attack pattern involves leveraging these links for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://billedbutikken.dk/articlefiles/file/26832620632.pdf In PDF document text
    • http://ladyvenus.it/userfiles/files/78657223477.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/7dcteeb2tc2942v887mtegovee/guvotitilusojuluj.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/xelafawebozasozi.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/tagekiwatun.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/woramovadumu.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52868e2af7---23801153323.pdfIn PDF document text
    • https://isosklo.cz./uploads/66829942982.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/gawosovadaxaxusamomen.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a6468d769---62663871916.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/gebaxemakevoravisafon.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/debelafube.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/marebixaragoxota.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/46872123124.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/0974ca8abde5b0c7c38291010900d9bc/80617682496.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ce9b5973e---zejewata.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdb482d9d8---27465399684.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/nutawabotijutakaguri.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/3tpuqcl1cg2fju4k7ff3ijlttt/pelobe.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160fa091113a71---77250415456.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa0a6f19b8---jemiletugegafukusofogoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=simple+wedding+program+examplesPDF 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_off000112a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB5 17548 bytes
SHA-256: 4a0657d9a0f2b90f20366dbd052cec5e218ae53ac6b12288ddd1f51cab26492b
font_02_sfnt_off0001583d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1583D 10900 bytes
SHA-256: 6ca2fb20af9f290f6cba40eaf8e066d6dcdfd4d2eed41ce92d4048b61176faaa

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