Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac692fa638c70700…

MALICIOUS

PDF

83.1 KB Created: 2021-06-28 08:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0e90dff85533cd4aec3d1aba57655e8 SHA-1: 351d69fcd0f82d783d4334a331491e140bb689dc SHA-256: ac692fa638c7070082efa5ad066df8883777e9935acfff20ad62d9889cd9c34b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/tfi07p055ca77kt3blojjamn7j/34239797906.pdf
    • http://deltools.com/userfiles/file/gafebade.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/90b66d24a90c64055fdf7e9a2f941ac4/komuriluvifolebiz.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/adf030e23041e3d61d0b51dbd79cc27a/83703174531.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/bbba867cfde608a803490d9e11867994/91238427971.pdf
    • http://naturallabs.de/userfiles/file/39981249123.pdf
    • http://cnex.cc/images/blog//file/sikowuwopilabenavofetufi.pdf
    • http://phuwangnam.com/user_file/file/gukaxezijusabixunarevori.pdf
    • http://ajtoablakcentrum.com/_user/file/wadupowakidamilipo.pdf
    • http://jhferry.com/data/fckeditor/file///14705189809.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc39c60b2a3---javizexokamefikujuzavor.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/d20ok11c57t82jqabj7s7bvfic/diverera.pdf
    • https://aquatrustfina.com/userfiles/file/gelidofefit.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/554a11c07919fe72436a35fd3954fd4e/zasajexinudegoz.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d9edd706582615bceb572569063955dc/3823238458.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/cf600be0264746785f1789a50adb9530/fejepal.pdf
    • http://bjaimama.com/data/upload/2021/06/file/202106041712455738.pdf
    • https://akapacha.com/userfiles/file/11517734293.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=norm+referenced+measurement+and+criterion+referenced+measurement
    • 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_off0000e26e.bin
5e2875d325d2d3b19341fee777ee921b1a0eb16ec1c789496264af8c028266d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE26E 10668 bytes
font_01_sfnt_off0000fadf.bin
0cde75c716aa45eff2d3b3683b24e68865ae51c54b357a87f5da4b4a32490cf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFADF 16832 bytes
font_02_sfnt_off00012707.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12707 16792 bytes

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