Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f49de1e169badb8…

MALICIOUS

PDF

86.1 KB Created: 2021-06-28 00:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 35a118b8aa4d5ef961f21eefe7f8f71a SHA-1: 6dd66cf5e2933345337448d8da33154a8cfbcfe4 SHA-256: 9f49de1e169badb87c43c1fee73e6ef39504d6c7aeddd96dbad505d21306be5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress sites, many of which host PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for SEO poisoning or distributing further malware. No scripts were extracted, but the structure and URL patterns suggest a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160ae975bdf487---fasapenotavegejot.pdf In PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1fcf922b0e3b8004b54003dc4dada675/gikufapewatefigi.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/83hmhk541a9bvv0g4so0mkij21/42442842448.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b246113064b---52910586413.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/37991850671.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/uu35cgnquue69cje73hq5dh0j0/lilajoxovivalegumovogi.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871cd4b87b2---25585981123.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/rfvqq0vchmls13mps01at5jtp4/sevafavamiwefuranem.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/41998256633.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b605591d71b---87326273634.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a596bcc742b---25528454613.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160710128c88ce---50739745156.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/88dc56aa8ec13ebe3d08435e84d962ff/penekiwebibezunenebekexuz.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec76cd0a18---sugirugale.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a2feab432---41643758862.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/530f087681a4f0f4e6a2bc7a0a93e900/kagiwatonanomot.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/zidifaxabaporalukonuwuw.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/wijekowux.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/65204233163.pdfIn PDF document text
    • http://sun-eko.eu/files/file/foxunefunude.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/zuxezufimikatofovezepuder.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/71769078738.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/45654a8a77f1fa7cea6cf151c890de7c/41440998448.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a7a85bc0b2b916d9694db5affdb1e80a/88784866454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=minecraft+how+to+get+out+of+a+boatPDF 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_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 16952 bytes
SHA-256: 7d91573d0d0d835ff288144add58d85fad3e5b1580e7005cd955db20e3305ff7
font_01_sfnt_off00011a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13274 10720 bytes
SHA-256: f5a64ee63291bc31df18a2a63eac08d8eab2b4c350990ff42c3362655ced0943