Malicious PDF — malware analysis report

Static analysis result for SHA-256 d372cb7f409c5435…

MALICIOUS

PDF

90.7 KB Created: 2021-07-19 07:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b39707bb8269dfa59fdd4069f3626fc0 SHA-1: 8aa8c6b72b182c89ab0236ff14797741007fed15 SHA-256: d372cb7f409c54353ca025b585eea1fbce8cca717ccc23e595fb3a1b95e9899e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, forming a link farm designed to redirect users to other PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a multi-stage attack leveraging compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae94358156d---32644899955.pdf In PDF document text
    • https://dogathermalhotel.com/resimler/files/xunulo.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/56783314856.pdfIn PDF document text
    • http://asustainable.com/global/file/16313667764.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb26212c3d---43482136175.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/amv0fq28ssu34s7psrejbh9d4h/63319806960.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/tojojapuwomivumevabunaza.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/15559823237.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/xafulupetikijagavob.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/losijazijagi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/vuxumidoluvorivewu.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/45c5ff0de1b61787b8b0b30fa20a8a0b/jokafubapimosojokipaleziv.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/d2aa0d91c211c88cbb9cc870ca293d49/romowixiv.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ed0a80380---7079234947.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/r438ui4081mtst2ood95rjnhgg/91399149537.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/86620212353.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a4be2f701de---4601762360.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e5ccf02a6---9462569901.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/oaa57lsk1605dovkiq6ahr70ke/pominavab.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5a4362be3---vatimejulebosisupavetux.pdfIn PDF document text
    • https://seerupit.dk/assens/file/tanij.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/ab359124b4af910805e99ead3f52ce2a/79084542420.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/6uoel77qg5l72k07lvr1och4p2/99283240873.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/e55e9d5d1496a5847f9286e40f858946/7437093220.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/73619268508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=french+baroque+artPDF 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_off0000ffca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCA 18244 bytes
SHA-256: a25c77a38699e47db2957b0b7bb4f9eba58851bd04e93efdeff1e44f15efa0da
font_01_sfnt_off00012e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14658 10384 bytes
SHA-256: e18a08fccd70d3ef4a006e4b140cf3e9eda07c9f8d1573cc2d4d29290e594f70