Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed725dbf53124b1…

MALICIOUS

PDF

94.3 KB Created: 2021-06-28 06:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec6a734e86a4c748b5b4feb7ebbe223c SHA-1: b7f095c2fedb572b632fb3145677f419aa7223ea SHA-256: 1ed725dbf53124b1a140094a5fe5233a8fee0c8c10c31a0558fb9156494668bd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/35edba812db3d136ada30d0721db136b/20606477639.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f1e19e04c---36386927582.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160941b0242c53---pudifuzopaloxatow.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/0ecddd6019f81d969d74d0aa05bed54f/fevivowevujarozeg.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca5795b735---87375874013.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6817bc9096d805fbdee59cd4dc81f683/6378148113.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/867dd61ec42ca73abdc396b2cd15f9d1/fisipagugitavubakipo.pdf
    • http://rzn-house.ru/upload/file/kidibutuneduzes.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16080dffea93c8---laxivix.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608703d52d127---lununubimodojogad.pdf
    • http://telekommarketing.com/firme_data/files/41604014130.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb265c2773---95715348654.pdf
    • http://kadh.kr/bobod/upload/file/jajafoduvafaj.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/krr55fap9m4rht10h14bdqelkc/gafozovivulokipu.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/62f9854a35f3ca1c6f0a2b6926da69de/33851935762.pdf
    • http://ownlines.com/upfiles/file/dikirovosotimepefanomidi.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160701fb82f45c---62934211615.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088448556751---rixifudanipozifatega.pdf
    • https://mimpishio2bet.net/contents//files/65873207023.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160abb1902a9d6---domalalumutunalakolexub.pdf
    • https://groupunsur1.com/contents//files/lovesutijifuvuraziw.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/geeqekvfm09otkjqov0p3bqh2n/gosanuxodukotuxulula.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/26b5b4753d54553a109b1649bfd86d9e/27158097098.pdf
    • http://zabradli-znerezu.cz/userfiles/file/74791838977.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/27de3c0ab975b1fe2d8bffc247400c6d/99855246663.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=products+with+saturated+fat
    • 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_off00010936.bin
c3848c76d0917374aa6bbe6449c200b3b24dadd5415b7133d51195d11357ce01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10936 10612 bytes
font_01_sfnt_off000121af.bin
a45317fb4b0a12f54695bc34e3e2a4a6a01abbb896b720945926426945ae2ce0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121AF 19252 bytes
font_02_sfnt_off000153c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x153C3 16792 bytes

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