Malicious PDF — malware analysis report

Static analysis result for SHA-256 68fd3d4666442d81…

MALICIOUS

PDF

83.3 KB Created: 2021-10-10 08:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 73af9259a075bb0295763c2eec8da8ea SHA-1: cec2d627e13c85410dea6fd68e0dc4c6bdd80970 SHA-256: 68fd3d4666442d813fc67a05c550f21f80ca7dcff6683b908f5d8d7b199b6350
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm and a fake invoice lure. The embedded URLs point to various PDF files hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://huntic.ru/uplcv?utm_term=salary+slip+format+government+employees PDF link annotation
    • http://afslab.asia/upload/files/puziwu.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/dajenijubiri.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/33233470679.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/pibazodawozoriv.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/fawepop.pdfIn PDF document text
    • http://giga.sk/storage/file/gapaz.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/40970831445.pdfIn PDF document text
    • http://cutskytools.com/d/files/32993493184.pdfIn PDF document text
    • http://dogable.de/userfiles/file/gotuxepevosoxokoso.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/gal2gvnjr76its679m5c6qsdnp/muzudo.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/bb7c8fa99d7b5e9964feb571c768dccc/20102693176.pdfIn PDF document text
    • http://idevoz.rs/files/felopinadaza.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/tuwevelegujufifosoganarug.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/ffb4d35785897a783eaec13c95f37c0f/muwewuxovan.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/kizofaxadipilamez.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/zijojetudin.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/dexutofopetupedumur.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/82139076911.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/h9jrrlnl62rd9v5k92tpnd9g4v/fiwowozogowikefenar.pdfIn PDF document text
    • http://expresskaliski.info/file/kesodin.pdfIn PDF document text
    • http://17njl.com/userfiles/files/tujawo.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161589372f077f---jamifefane.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/sejutifovulod.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/zokedolupaxopufip.pdfIn PDF document text
    • 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_off0000dfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 10956 bytes
SHA-256: 3b7434668f95a3735726d2c259cabc9eb71e453d3ed7f84eb39b6125af0e12a3
font_01_sfnt_off0000f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11164 17636 bytes
SHA-256: b21903269caea779e7e33f3066c5a9eb0a8d030224860956a1839705e2e3d1a5

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