Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa43e92fc12043f5…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 05:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ebb5fbf9a1501d256ae2c822ff0667d1 SHA-1: d62566efb40e8ff97ba5d506b9322e6fc4e809be SHA-256: fa43e92fc12043f58097421e39a4c3b343f26b98c00fe56eae0e3ab050ac1417
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, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/75d479c573962afb2459fc343fae8413/64624611594.pdf In PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/bodetaxugi.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/4rrolj078eod9lhtbcve65lj4v/xobawiletelexatetux.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdacb34b0a2---84864053361.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/57978079762.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/78008696458.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/fugerupuverimo.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/rekokawesepiliruv.pdfIn PDF document text
    • http://clase86marista.com/clients/25276/File/gusiluxosurebi.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/l9qrt5u324tv7h7kbsqd1hbeu8/27649534304.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/fukesopukaxoditenoxoxez.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5e7e53490---29613445059.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/vumigopisap.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/04314ec996b5aefeef7e0600f20db5f1/kanajepoketer.pdfIn PDF document text
    • http://lactopad.com/uploads/files/tiwonifojar.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/kutijegixelenegutosenufa.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/xudinufunupisazirerebukiz.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/4478096879.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/6427648846.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/4abb9b775d767d180381d15ea6b8994f/36938342744.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc00755bae---39879606972.pdfIn PDF document text
    • http://nfc.soo.jp/file/wopirurofopumomirawove.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/darijeviruri.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/94511152173.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079a3b7199ae---xojuvotufaludimunidule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=english+for+presentations+marion+grussendorf+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_off0000dd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 18476 bytes
SHA-256: 7ba5337252ee650624e93e2dcc2f3db5f6f8a5a5e663501349b0eb49b6e31e61
font_02_sfnt_off00012563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12563 11028 bytes
SHA-256: 2da9dd984670e7630202b7e2240c142002473f1534ab9314cf0db69c344c5825

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