Malicious PDF — malware analysis report

Static analysis result for SHA-256 9139cd9b4cbbd8db…

MALICIOUS

PDF

86.9 KB Created: 2021-07-27 10:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5aaecef0e033c25a101356aeb742333f SHA-1: 4d2491daff82876f379218da2021199b87b12a6c SHA-256: 9139cd9b4cbbd8db5d4e472b21cd7ee23cc7dfb826ea7f0ec26b29ad0462e66a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm strategy. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware through these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://mlbcsimleague.com/ckfinder/userfiles/files/92733433968.pdf In PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16096750442c58---ramikarivuse.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/gim26rc503ta3e14a9qlntc1l1/furuvifidures.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6505a52d4a---sakemuza.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b4954c8cd78---gawawakuxipikipuzumeleke.pdfIn PDF document text
    • http://zenithmetals.com/files/jiluvedalalitixe.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/xevokome.pdfIn PDF document text
    • https://digireg.com/upload/72021391409.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/luperureka.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85f114ba6d---nufet.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bee52c788a---xoxomerulumi.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fac9b995529---foparuwekuvej.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160721e8cef885---59988083752.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051923155573499.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d2fc6681b---xemaz.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/52184417838.pdfIn PDF document text
    • https://mattress-leader.com/media/katujatozud.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/misaxavata.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16075e785cd8b9---nududali.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/91059849002.pdfIn PDF document text
    • http://air-con.ru/upload/files/xidure.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/33032383874.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/23537033001.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/fewanagefudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ms+excel+2007+book+in+urdu+pdf+free+downloadPDF 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_off0000e58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58E 11320 bytes
SHA-256: 61ec61db088b698d811822ac5d14ab256e8dfb1621c0963ef0f8035d5aa9cfaa
font_01_sfnt_off0001003a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003A 20712 bytes
SHA-256: 8c5f8f951f87052857db94565c6561e3c0be5d6ad1d62ca3e15f20628c34803b
font_02_sfnt_off00013541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1