Malicious PDF — malware analysis report

Static analysis result for SHA-256 797d488ac927b69f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 04:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9d37f5d762ca1834e1f735f2d19199b0 SHA-1: c954e42aca75ffd9756883c22078892db7c5457a SHA-256: 797d488ac927b69fbf9fbba8fdc09a90fb0e8b8f1538e5bb870bc3ee0e600d91
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised WordPress sites. The document body is heavily obfuscated and contains no readable content, suggesting its primary purpose is to host or redirect to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/1f70cc88cfaa1a88386ec149d6a90b7c/gikavazenitafifevike.pdf In PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/89843945703.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/73993846608.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/kagalulefupidetifexomu.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/podomiwurimekedu.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/a80baaec9ac553f00e9ecaa6bcd6e544/poworibejamakovuw.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/k24ausf0uaikecl91vp74stqp0/narojizutafe.pdfIn PDF document text
    • http://klpa.net/userData/board/file/nafedonatuzizonubipiwo.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dfe14bf5c---senixovigudir.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/natoduboxos.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160825abf28c4f---fopamuk.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e442267428e---vezefodewola.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/duxivujibuxavozadilan.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/lidonupokuzelasegewafoj.pdfIn PDF document text
    • http://k1a.ru/images/files/file/sujavuvigiwenarakad.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///67220259705.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071ec0c8f401---98507694447.pdfIn PDF document text
    • https://gannat-ltd.com/userfiles/file/sowagapukigumavegunoneje.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e7d8a8ae6---58064041271.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/dituvivivufur.pdfIn PDF document text
    • https://renetravel.ro/images/files/gawenejakujusatopoviz.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/42699068008.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/d6a21093a40e5abe47a42f114da8f4dc/34612482816.pdfIn PDF document text
    • https://hgb.se/filer/file/69436506630.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/06143d76a2317862485f75e304aa53d1/44949599502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=currency+wars+book+pdfPDF 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_off0000d811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD811 18772 bytes
SHA-256: c9e7ac07b3e4aae2ecb1f66884ad8ea2c5fc20b8d42d5433918a4c4d4842c5df
font_01_sfnt_off00010938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001214f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214F 10940 bytes
SHA-256: e6ddd6de11d11de9cd9a59c0bdc19cd8f1d2d1c1163562a2f9d06bf55412fbe4