Malicious PDF — malware analysis report

Static analysis result for SHA-256 620f1b9a41d9cb31…

MALICIOUS

PDF

82.2 KB Created: 2021-06-30 11:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53991b84dcc8d90bb1ca214f43903ab9 SHA-1: a38a2ff9cef93c5d8e5f0afdf29cb6fa68cd0566 SHA-256: 620f1b9a41d9cb31d981bdaed0f9928516814e732ccaf6e5281aab58bf8b30dd
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution lure. The document body was unreadable, but the presence of numerous embedded URLs strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/7746e47e73b8982b74cab90bb386b8ae/vofezefodenegonurabakuzi.pdf
    • http://georgekoldun.com/var/upload/file/jifevimakegifuniza.pdf
    • http://akkoryazilim.com/userfiles/file/mivolulovif.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/46dc984fe302367acdbd6c96cc1b8244/17747857495.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/cbo33utfch0dlti4m99smft3bb/gasobusaworavopasude.pdf
    • http://nadiadsa.org/userfiles/file/51025155761.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/dabf6cdf7593e53170395dc1caf126d3/wipesa.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46a6f140ce---musabez.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5cafaeeb04551032e7ce2b14c63d128a/nixaloxizirefobebiraxopo.pdf
    • https://tiklatakip.com/calisma2/files/uploads/6662072596.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160acd0f29a20f---vibuzuzoxigeki.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094174d29d74---ranebozob.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/2524000f45a652f8357491552f990133/tekafodolakapopibiramojem.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b643ac96---72286563164.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf2080b412---wobigomekoviwuwatejumajar.pdf
    • http://supair-lux.hu/ckfinder/userfiles/files/83558846535.pdf
    • http://chiengthai.com/file_media/file_image/file/vujugixuban.pdf
    • http://www.bluewhaleline.com/image/upload/File/36167767567.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/7c43e49d7446d55666949b289795b92e/pamixabometer.pdf
    • https://beysukonaklari.com/ckfinder/userfiles/files/tojube.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=twas+brillig+and+slithy+toves
    • 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_off0000dcb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB5 16792 bytes
font_01_sfnt_off0000f4cc.bin
9e03c86f37f7d497853a86112175a7a46ad7211957465e812b1ff67371bfc241
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 10896 bytes
font_02_sfnt_off00010dd1.bin
06a366548292ac283b7295049520f986bb93421345638ca965abc08ceb025fdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD1 17096 bytes