Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00fb3f3e5113cb7…

MALICIOUS

PDF

81.0 KB Created: 2021-08-13 22:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 085511c1bc569ebe9cd8af85e3ab132b SHA-1: ea26ee1382a443b858315d336def02f42e8da00b SHA-256: a00fb3f3e5113cb793c3858ee5fe4649d2ed55d300fc3340f5d5c4520219e61c
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly support this assessment. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zafirkort.com/uploads/files/pidonexukujozatonamuf.pdf In PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161032185e5d8e---66678341176.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609de928ef819---20598281304.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608091e4eff4c---wujejejekovixiwo.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bdf02627a---55831390396.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/bufujasefufe.pdfIn PDF document text
    • https://binhvi.com/upload/files/79839529327.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/i1rt3c6tkaoi4dl6s2ld20eg5r/15987291829.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/vimubiviwun.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/2ef9e540a081ad80a26b3cd28c861486/konagimirekonuz.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/55cni1job3r12i6l8n4fu0uh8i/xarilukapiwubarepoxabe.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1cdecff4f---9752240260.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/36675282734.pdfIn PDF document text
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/giguzagutetijew.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608358c33bb45---tokabimoxawupipixi.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/3be1b5597e2b3f89408873907fc11741/1759477658.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/15535033577.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/wozav.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/m0nlqf1lieopjck5p7p45fo651/23703433246.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/51691411861.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/26373974096.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/026fbb38fd6e2e4a24ec639ee4177e30/saxajamebosinejegekekep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=siyah+yas+profil+resmiPDF 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_off0000d927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD927 18080 bytes
SHA-256: 4d6d479b94d57aeb895fe7f31f2e4fe2cddcfde034227b5bf1f2ffdd4625a2ed
font_01_sfnt_off00010462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10462 10608 bytes
SHA-256: c9f2a074260c78e596f7b29e40d044a9bea6a5cc894621ea5a798e4d815d8bab
font_02_sfnt_off00011c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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