Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a437f97f466c941…

MALICIOUS

PDF

100.9 KB Created: 2021-08-01 15:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7ae26255ab4908d4a970ed1fdb8bfef0 SHA-1: a69930d0cd46ea7cdcebd1e5dd25b4ca90c178a2 SHA-256: 5a437f97f466c94132da8bb92ec1a7811c2c8c74055f6850275b14ee274e0a7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While 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 0.9979

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://funperm.ru/content/file/15746537237.pdf In PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac5ea12240---27750336464.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/jilof.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/fd2200c99768de7ca3a27771b262512d/63767049487.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/90644946325.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/4830b468bee6e2980e1681de0a409965/51319807145.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/nimogugixapifitefolukugu.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609492ea7c9ed---jolalokekuzemara.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6497f68a79---dawug.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/1c9f18679e150a22fe39bc401fe85825/94981131272.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/ripusuwil.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c5442341ee5---dopemavawose.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/31170062711.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/makejisiw.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fca3999c36---vusuzumaziwakovupabilijux.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/femeduzanisok.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/18our7tq1d6r1ceqabqhaah8a9/filozifoduruzoragapi.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b3db2a618---nakir.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/rozad.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/suvoreduwurile.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161003cd08a7f3---81665184299.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/746145565370ab4babcbf84bd8e42f0d/25084246919.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/49018443282.pdfIn PDF document text
    • http://secretinvitation.net/images/files/79692295623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=libro+el+azteca+descargar+gratisPDF 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_off00012163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12163 19348 bytes
SHA-256: 30e9f53bc739bda2b4f9ceaf37f14e7785055a173bac33996e4ac719c7ea6a83
font_01_sfnt_off00015333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B4A 10600 bytes
SHA-256: 4abb38f6b74e3fd89237ac2aae02e64ce3e9a4914320f59974565792329ddd74

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