Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac01b232526773ad…

MALICIOUS

PDF

91.1 KB Created: 2021-07-03 03:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfd340fc4969a7fccb8b12ff806761a8 SHA-1: 751f3c16ce447de037b14e90153bb7d9d31d47f8 SHA-256: ac01b232526773ad5965c7fbdf674f3d2cef9e6c4f52e44f60e45a49e4c4ae55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://archism.ru/uplcv?utm_term=united+states+history+reconstruction+to+the+present+pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae72ba85064---37552136683.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbc8616f00---17240645501.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc2aa8b023---59092338258.pdf
    • http://slsnn.ru/content/file/93112262762.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/57tosplpm752vf4gj7sknoif89/95656269204.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/iir8l01cqgk78dra2hkosfge89/bivix.pdf
    • http://getampedmag.com/ckfinder/userfiles/files/mozisosiwif.pdf
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/zunorizeliwerop.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/0f962a51285da8c2db57f0ce23c521bb/rikogazorivebuzugabitof.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608525a6c273f---sunogub.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9753033a5b---nogetofasen.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/toxofopiramilunejifu.pdf
    • https://bigpointpin.com/calisma2/files/uploads/giwitupemabirinatowixomo.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/df4fpm17prru0jbv80bj7mv9s1/3545024563.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/gobdo1je1je1kff6i06vs8mnsr/wowotili.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5718c90ab---tegefiwozulafinawelanuwi.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9b6a9749fef979c1d9fcafaf202cb4de/kugagiti.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/9212710392206666a6d95709fe715f75/49431496144.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebbd0953d2---48528949340.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b576cb4c8bc---xuwipaxaposi.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/e87d1b58d3b9339071666370666f0be2/65154309386.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_off000100de.bin
e34eba9fda21d2b1b8fde1953f57b33c2c42057da81fb3ec60da3b8cfa3fc643
pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 16572 bytes
font_01_sfnt_off00012bf9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF9 16792 bytes
font_02_sfnt_off00014410.bin
b4d66583b6ec160f3c59af0d7a7a43007cb4e0d016fb19ce70f1c3e869662909
pdf-font-stream PDF embedded font (sfnt) at offset 0x14410 10892 bytes