Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83f90c0e793c236…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 06:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba7d58eca19e0ba9b025701becfa5d43 SHA-1: ab665de3bf0ad6a44ade8405476ebd121e8aba25 SHA-256: f83f90c0e793c2363cc10f1ee04a92cb49aaf6cfe0bf88e427fca3f7fe44bc61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely to lure users into downloading further malicious content or submitting sensitive information. No scripts were extracted, but the presence of multiple compromised CMS upload links suggests a pattern of leveraging vulnerable web servers for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://oniceh.ru/uplcv?utm_term=scan+to+pdf+file+size
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/74b52c53c25b2036ca2512d1ac997608/rogovokeritum.pdf
    • https://zlatartopalovic.rs//files/96682243022.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1a13a2800---71529817368.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/3f98cae091b8a0d1b7522e43f128d1a9/11222475741.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/pulivaxe.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b09725e5c7---jigaduba.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c2aeb3fce---65366560123.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9abe0708a39ef4c884b8844430c6b5bf/24322910843.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609884d3c5b43---27907201665.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160739c4e96d02---duxuj.pdf
    • http://narnivet.com/userfiles/files/manezuma.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609cffeecc442---bogagafezixalerozizulojof.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/4bdd85210d3863c45c0f234426e01229/12423101922.pdf
    • http://halaljones.com/uploads/files/nonutoju.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/6277bf63031e7b76369fa0f21068a115/8361960984.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee066fcad---gabivotogo.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fdacdc0e1---64470929099.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/307785ea146ee40122d6f62136b7a036/27375033069.pdf
    • http://bawaconstructions.com/editorData/file/77890976575.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/66a939502d02d739a3c4ce09562244cb/59136119481.pdf
    • https://24emk.ru/ckfinder/userfiles/files/58092872169.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081303484e2c---22312432030.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_off0000eac7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 16792 bytes
font_01_sfnt_off000102de.bin
127e593870624a7663764875faafa1209f540b47ce7ff41d511704c70ca3aa34
pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 10648 bytes
font_02_sfnt_off00011b69.bin
4cbd8949911024c41223766d2f2c4b0445a755ad2e58284c5948be5b3e946a18
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B69 18124 bytes