Malicious PDF — malware analysis report

Static analysis result for SHA-256 17873fe660d59523…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 06:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bfe2828d28c18f66a7a8b7526632ced9 SHA-1: 11fc63b703cf3a70b8d7c3c9b076adf1d580bd0b SHA-256: 17873fe660d595235f412c625851ffa39505bbba537d9bc23d6381714e63cbe7
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of compromised CMS upload links further supports this, as these are often abused for hosting malware or phishing pages.

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 http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/zilugamezedonakobew.pdf In PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/277deb67c06b8049ab34595adb2e5b25/disuxomavilagarifogitip.pdfIn PDF document text
    • http://mopron.ru/upload/files/17458851266.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/it7qs5d94pdephrnlnk594r0t2/golafepogaduk.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/ginupili.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/22922149994.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/zubifobo.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/kadas.pdfIn PDF document text
    • http://congluc.com/upload/files/98769545920.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/45955466899.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161393f4cebc33---niwud.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/83864541980.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/24747518761.pdfIn PDF document text
    • https://virker-ikke.dk/files/toxorefe.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/8701429361.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/riwuwumunuv.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/povujefixilosobod.pdfIn PDF document text
    • http://888chji.com/userfiles/files/jawuduvamekutapug.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/94114244436.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/ziroparuwivexagifobuxawi.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f737b8b490---70938383177.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/sekipumiwivi.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/80987048579.pdfIn PDF document text
    • https://eetravel.net/file/tevugej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=best+steps+app+androidPDF 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_off0000e54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54C 10392 bytes
SHA-256: 8a557b26476deb4efa2f2290030eea8615aed9e24b624dd53c319fc688e58f5c
font_01_sfnt_off0000fcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF1 17672 bytes
SHA-256: e88ef3ad9576dc77cc7f88d083368308307be2dd72677ad0ff0abc0768f41232
font_02_sfnt_off00012add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1