Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49c3431d2048d7d…

MALICIOUS

PDF

94.2 KB Created: 2021-06-28 00:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc7854e8767e92f715a86aa8790dbfbb SHA-1: ab8fdce191a1e8a88058afca7b1b5c7fdaf2007f SHA-256: c49c3431d2048d7d3b3da28bb396e13686a294690157e1a681f9aba2e7a3333d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO abuse. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, often involving embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://diamond6ranch.com/userfiles/file/litobakerubumija.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160983b01b744f---98788498977.pdf
    • http://autoscuolepintozzi.it/userfiles/files/powejitafemijej.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/07509e05d7f4f45d086942c58e56df12/84570376812.pdf
    • http://newgatedesign.com/Images_upload/files/lekujelixuwaz.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/4l1cbiqortoiagik2d4r26gd3s/79850913052.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/j6ttjs6grlhu9jeuml5i2j4226/buxifedukuwowizevevu.pdf
    • http://richmediahouse.com/admin/uploads/file/40897262127.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2495dd3863---vokisibe.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a24f0861f---jegolanatuzobosexaritabe.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cc8e93391---45404687714.pdf
    • http://vimbark.sk/editor_uploads/files/87821382660.pdf
    • https://laser123.com/geektic/files/witilabudolumuju.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743f357d4fc---7168669913.pdf
    • http://1qjd.com/upload/files/2021-06-24-07-47-20-TyMn7YFE.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d0ffcfcb3---35018401914.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/171c8ab4e11cd549ccc56a169cbb3c6a/3351964490.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609db0609b397---jurufu.pdf
    • http://geyikkimya.com/userfiles/upload/file/muxokurujelegig.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/e2faf9d8360bfa922866db2837b82134/tidotelazijageg.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/cefc98933258f22948cacf44750b5f61/zejabe.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/783908731a636ff03cdcfcd2bd24d252/tumawakujezare.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f74a5489---jopanuj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=diploma+of+justice+salary
    • 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_off00010ea5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA5 16792 bytes
font_01_sfnt_off000126b7.bin
49508c1cebc44ded2b3a7d1b026448c61702d7e2f304f8097b793f9e71b115c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126B7 16716 bytes
font_02_sfnt_off0001524f.bin
37dffdccca5b0383aef9e32fcc38b0521c3cd9179f2e74544dc38c6d3e101ad3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1524F 10884 bytes