Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a476ab2f368892…

MALICIOUS

PDF

87.9 KB Created: 2021-07-13 21:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ad9075747cb04368c4f9d522e798c9a SHA-1: 26274e62a4e1b8981182a80db97b75d3233b176b SHA-256: d6a476ab2f3688925410c92a23fc12106043adb2783b1f140157584ffd88ad9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document body is heavily obfuscated and does not provide clear textual lures, but the overall structure and URL targets are indicative of a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085087871303---71709158354.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/lqtvlbrj327hiag1rgofmi2c0i/feregaf.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160887aa8b3057---sijowamigul.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5020885d6---14356948058.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd8186e9fd---81875459369.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/a88261e9f54a9a30bac2c429cc1a8c81/gomegonujivem.pdf
    • http://resetimpianti.it/reset/public/file/4597342741.pdf
    • http://swaminarayangm.org/userfiles/file/33723088489.pdf
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/g81tsl5t2ojupm40e3ur1ateb1/rajoperufigavo.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/r38vu8oubtjfkb7pfsgm89khnr/54179477932.pdf
    • http://provia-events.de/pics/fotos/1/file/14502628381.pdf
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/14912211401.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/62d0876dcf27374bfe7a906588b45bcd/55917403066.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/6rg4e26c6e6cjns4qfhmulrai3/velafutuv.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9cf28eb65---lisavujexeveraxus.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/b2d3195a7bb47958340f00d860de0224/24994327323.pdf
    • http://master-sign.ru/ckfinder/userfiles/files/55205891751.pdf
    • https://giriconsultancy.com/content_files/files/kijaxepogaxakakipesoxo.pdf
    • https://mimpishio1bet.net/contents//files/pawolonixugawexejebojefo.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/1h6ogmbeinn8mp5qs52cavv160/kewuwul.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/a43eb206c30330c80aac3fa3d88352d1/96067814706.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/zelin.pdf
    • https://ascinfratech.com/clientprojects/trading/file/68693593575.pdf
    • https://nocenzura.space/web/img/podborky/files/6837300410.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c99d2d0d30d8312db6f2c514846a1776/20746430966.pdf
    • https://elegune.net/files/galeria/files/81390144001.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/cadb42982c2d71bc17ac1fa2a3fe8901/dodukugoma.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=clinical+and+translational+gastroenterology
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d615.bin
59a05cc234a75a81c52730d4e525866c76be2c82036908e8b3672b13822223f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD615 18532 bytes
font_01_sfnt_off0000f380.bin
8df7dc733b7c01e8ccc6a266837291d823bcc50e2583a4d5a8730a220365dcc7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 10692 bytes
font_02_sfnt_off00010bfc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFC 16792 bytes
font_03_sfnt_off0001240e.bin
f728fbefb610588aeb74b8f135ce95b649839f4a1d42621c62a60f7993ef3143
pdf-font-stream PDF embedded font (sfnt) at offset 0x1240E 17352 bytes