Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cfa7ceb0a19662e…

MALICIOUS

PDF

86.4 KB Created: 2021-06-27 08:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de6e87b840a90463a5de0a67d7d50bf9 SHA-1: 5156d6dc9f0c72dce8139dfee49b31a0373525ee SHA-256: 2cfa7ceb0a19662e4873f1c640e9d07f6b4a2024646bae6e29b685325fce70b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs and link farm structure are sufficient indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/le6ik03inmiq7kmvho7o5ulkdq/48580239191.pdf
    • http://azizolace.cz/images/file/kawinenokunobuze.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/m5ccuopv8ieda3sjtitl7s7mf2/nulogetenerenaxezunesejin.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071fe603e048---vonowuxu.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608efc1a57777---53545280383.pdf
    • http://accessprecision.com/userfiles/file/zubavudapoxesune.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca9db2e2c93---71039688174.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/b6e2e5ceeaa462f207a1f09e7892a99f/babevatesisebikuba.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87d287241---77732333736.pdf
    • http://beiwendq.com/userfiles/file/57856439598.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f626886fa8---dikitodevibolapatavaniri.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/956f8832498033244eec6cfd47196143/zaxomebidar.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ac190b849---zafofawigojexuzatakedujab.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d33af5cdcc---mukuxabofulirimitizazoba.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/64646310551d9c97ce204fb60b83cd35/16146744559.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/qs85htakgm1nfvs33etf7rmake/pupadevevidi.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de53a4252a---vemizotokawavume.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/cc0ee868292ae2e9a1a51c7987f6572f/30683099744.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/3e14a576ce8804136848c2326a0a5b05/22971723577.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb477e906b3---fekexovizamep.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/b52da24dbd20f00333d512cb62fc329b/43562798513.pdf
    • http://eventologia.com/userfiles/files/36255444099.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a80de638e08---80559909155.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=difference+mercy+and+grace
    • 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_off0000eebb.bin
e39d08952bf0a1e1e591f817a2572b9c85d7e6086b1b7c8b33a94705e19a0708		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBB 17272 bytes
font_01_sfnt_off00011b36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 16792 bytes
font_02_sfnt_off0001334d.bin
dc62f5324d85897a5091db83526eb7831a809c6addf5e573fd591c1e6bfca7a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1334D 10504 bytes

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