Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ebacf41c7eccc2d…

MALICIOUS

PDF

93.6 KB Created: 2021-07-01 13:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1be229b207cd502fe6afa44da5ae67a8 SHA-1: a627d054bc46c26248e23011311c0507af2923ca SHA-256: 7ebacf41c7eccc2d43939be21d9b06df27cd1d3810c31104169088fcb9d73ade
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external PDFs hosted on compromised CMS upload directories, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure points to a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098856329d1a---83517699470.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b06386f7e38ffabff5df272f494d65b4/5597409575.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3100c757d---japejubina.pdf
    • http://gld-lining.com/user_img/files/46588557766.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f3ffb2bae2ed07b6bd423d29131acf3b/79039469282.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7362ngjcaml76mb6kj0h9jjlr2/zejenilelemozegidizinos.pdf
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/vamazopu.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ca3acce78---miguwikud.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074257d1dc98---82349302719.pdf
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/gifajema.pdf
    • http://bygreenpure.com/userfiles/file/47908826864.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd650500dd---lakol.pdf
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/6872096129.pdf
    • http://jevades.com/aircraft/fckimages/file/10051253042.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69d2f2d972---65363889289.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba48138cb---goluzevuxovovavezukamu.pdf
    • https://dm288.com/slicice/file/96037372633.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b75ad1f4---43530529848.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16086d37460e8f---buselomaretuposako.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072173f0a970---zumemafeg.pdf
    • https://profix.fr/ckfinder/userfiles/files/lorasibuxavokejazof.pdf
    • http://inezorviskids.com/clients/37546/File/6511416524.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/32931915498.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/h09oofnqr87res1q64a5avlkmg/fasobazij.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6gthd0lh1dvobfgcaracd98nq/xinanogololirabajukiwo.pdf
    • http://lateonsettay-sachs.org/userfiles/file/morakilelakemoxifaxi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pms+cause+anxiety
    • 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_off00010cba.bin
c2570c2cff748e141317630765b9baafbf5e52bcf723eeaff0a0d10b9629619a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBA 17068 bytes
font_01_sfnt_off0001392c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1392C 16792 bytes
font_02_sfnt_off00015143.bin
72ce9a8b53cecff6e73aa46c576d83c627f81cc1057d4294d7812acce36b9efa
pdf-font-stream PDF embedded font (sfnt) at offset 0x15143 10444 bytes