Malicious PDF — malware analysis report

Static analysis result for SHA-256 f406f806b9ca5924…

MALICIOUS

PDF

86.3 KB Created: 2021-06-25 17:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 270620eef205211f668c30958384181a SHA-1: 26f5e5cfae5c316b4529eb67d373abd155390eab SHA-256: f406f806b9ca59244681ab48731ddbadd94298ded968034f26f7da4d7a284d9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ludifrance.fr/userfiles/file/gumub.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609839d2a478f---kafoluwenekisowuruxux.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b438fc735a---96833681513.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/0837c584f02486a867a356c9f5fb449c/vopubezakupumewoladupux.pdf
    • http://flygarfield.net/userfiles/file/ruzutomu.pdf
    • http://snap-drone.com/userfiles/file/koxirotexijagamozi.pdf
    • http://ohappy.org/userData/board/file/95062519436.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/qf017t9bcnoio1ebghhbn7iap1/lirosine.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c352bbae7---67576732925.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/ba46ceffe39810167dbfffa041faca92/sujurajibiboxido.pdf
    • http://omatsuri.kr/data/userfiles/files/gadarazo.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/dc88ba36c4c14c555855a080003931bb/35344817658.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/75853545344.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607202b8904d6---28119462741.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/ad1663fa0fb6e49ba4957ab38e1c0a74/22343462983.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=backward+and+forward+chaining+in+artificial+intelligence
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec54.bin
c60c34f46e92af140cc3f0f03cfbad7c7729ef9c9249080740ae252f6fc02ed5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC54 17600 bytes
font_01_sfnt_off00011afa.bin
328acc67097dea59e1b937d31f478f742326d88f574e7ac0af0169f3ea58b350		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFA 10820 bytes
font_02_sfnt_off000133c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133C6 16792 bytes

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