Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc087743701dcf37…

MALICIOUS

PDF

94.5 KB Created: 2021-07-05 23:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4df0b573c21266a4d82960728dc74345 SHA-1: 04986a20131c8e87dda560f48b0439d3a9be250a SHA-256: dc087743701dcf376fdf10da50a2654cef68a430d781b41bf6e7c570e9d45b40
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating an attempt to host and distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74a8ee7c9e---8412655061.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/a741b44d4aefded7e1f3acf05487a550/71646004477.pdf
    • http://barcabianca.eu/upload/file/pagalerikuxadodawujejeb.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/76d8ec4693992e2041d969afe69d36a4/renototor.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160884d0d6fdad---90812551042.pdf
    • http://liberty67.com/clients/41815/File/filitijujesezogelesivisoz.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9dfef29ae---nebadofubafofijubowuja.pdf
    • http://zoltysnieg.pl/pliki_wyswig/files/bipumomuzak.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607592bc53b68---9810054843.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c9ed1e92b973f9b3680210633e2582cf/95054853998.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/43491288418.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baad877c5aa---9405129325.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607621d607d6d---fazono.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/fm0c1f2t7c9bjg70o6d19ml4r3/tujapowomonifazawimelur.pdf
    • http://oishisushigd.com/uploads/files/87948483564.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c542a915b05---vofuxaxig.pdf
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/59350402407.pdf
    • http://penzionklara.cz/userfiles/file/87707692555.pdf
    • http://studiotecnicoforace.eu/userfiles/files/bezobapamavekedopanidaz.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/b8d7cdd8016c5ba0e2231bfadebae1fa/subisezolajesozaz.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/e6a0bc116e58341f1d57b776da69ba2f/jelukevo.pdf
    • https://netshopnepal.com/userfiles/file/14807306596.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/7ch7al2hft259vq1jaok83il8a/lobix.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=one+direction+baby+you+light+up+my+world
    • 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_off00010d20.bin
d059885268f87e2e77c6d7c2fafc86817583dd21b6dcf7a2cbfdf78180039bbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D20 17444 bytes
font_01_sfnt_off00013a94.bin
9c01ac9eb491f8f5b18ddf0c854d3e708623223d434c215f7644e57e39a94a74
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A94 11256 bytes
font_02_sfnt_off00015475.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15475 16792 bytes