Malicious PDF — malware analysis report

Static analysis result for SHA-256 234ab60532931d09…

MALICIOUS

PDF

74.7 KB Created: 2021-06-26 07:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b96d6e0135639006ee5df908c326c6ca SHA-1: cbefd3d3f3eb0d1b795ac3ab57f2639cfafc84dc SHA-256: 234ab60532931d096f5f2a87d36a1d4ca831cafcc27dfd6d5977e08b4279c991
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as lures for further malicious activity. The presence of multiple external URIs and link farm heuristics strongly suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=grin+from+ear+to+ear+meaning
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706c347563c---wowedogiponirod.pdf
    • https://appvid.eus/userfiles/files/69365955424.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/l8j1delfvdnf9mlqqjj9pfjlj1/wubag.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608d562047bc2---julalefesowubexikewufov.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/htfn4m6dbv2l02qqg5sl6rac3k/fonikowofuselonofawi.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c3707deaac791953a75ba02460ae6229/95357634481.pdf
    • http://vce34.ru/attachments/file/defajekujipo.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a07ed48881d---91786504468.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607909efbe942---63004882962.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/81405fc7ecf02d1c078f998a70f50b15/51267530184.pdf
    • http://kingnature.ru/files/files/mejasapamarosa.pdf
    • https://qualitymattressfactory.com/admin/userfiles/file/zewufojubazaparebajidatik.pdf
    • http://foto-klub.dk/userfiles/file/bipodijugigoke.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973a67667a7---vawazodotoz.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/2b3aec5c5c97606ef28f27d89c1924e7/35126669716.pdf
    • http://munnarinfo.in/userfiles/file/70150418696.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/14f8a625810951b8bbacefa63bd8ab10/witenezifukiwokikesogato.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/43df6003a608abfa2339fd646c279cd2/45401955473.pdf
    • https://dolupin.com/calisma2/files/uploads/fixibibidudo.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5a96e72bd---xasexodaxurada.pdf
    • http://comp-art.ru/userfiles/file/zujin.pdf
    • http://morard-mcf.fr/data/Files/bilolituzojon.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/6fc588f1e6d3fc69de9f3d1bedd40c59/mawidaxezukumenosam.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160cdccb65ccbc---woxifonuxevupegogimurarax.pdf
    • http://buergerforum-tirol.at/file/33562534432.pdf
    • 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_off0000bfb9.bin
01c4d3efe3f33cd7e96b27bd520d4f35217cbffb763686db4112cd2d27494c8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB9 17256 bytes
font_01_sfnt_off0000ec5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 16792 bytes
font_02_sfnt_off00010471.bin
bbaa2b20919c958a5201d283076e466546746e7ed3a62c07b261b8d56c85c351
pdf-font-stream PDF embedded font (sfnt) at offset 0x10471 10380 bytes