Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c02348b7debacf6…

MALICIOUS

PDF

85.2 KB Created: 2021-07-01 18:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2bafe4b4e10c433c7a5e7b0b2c97dd88 SHA-1: 1a1501252bb26d8b2d3d1969042c921bfda917b9 SHA-256: 1c02348b7debacf6be542ca42f1a82805fe4b31cead24328e4ec32150e1cbebf
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, distributing numerous links across compromised CMS upload storage and disposable domains, likely to phish users or lead them to further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the use of disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/tobutiniwisidunewerebixax.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ec8a964117431275fee96d9a0fd818b1/vugulitisawuzavajodi.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ca79913bcea---80114943613.pdf
    • http://alhouti.com/userfiles/file/78142806546.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c489d370437---90419378664.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/8nshamjr8gcu1v5bsfc5645pqe/34188148021.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/2deb9aac0ff9f8337b6ea3977777662c/28927487428.pdf
    • https://abouelhoulgroup.com/userfiles/files/jolutaxozodevurakeg.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/b57e5e4f301d6800e8ee000f7333ab27/jujowodesojotafaxiboxupaz.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa365adae9d---17603753604.pdf
    • http://greece-ex.com/images/blog//file/41277535727.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606da61c7a366---mejujofixipo.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607569fab80dc---fejajimafatorerijov.pdf
    • http://ahxxzx.com/userfiles/202105/file/bugatekirav.pdf
    • https://85097781.com/upload/files/sibunesatusa.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094e762dafb3---13696948606.pdf
    • http://velo.hu/UserFiles//file/65268780606.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc891926a3---kemutilidufotidowo.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/4a389b1d3d0470bada6a3d918dbda613/puvazetepi.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af6eb600130---nikazovuzarabovo.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/0e5d5fcbee5c53cd39c5b95a99d36c59/92679877334.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/745uapb3ni71223m1d0t9faagj/82821880985.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cc6bdca92---zajigubemajos.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=beltsville+md+to+dc
    • 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_off0000e9dd.bin
d7e884641fec4877f9ed48921c2be71ba94dc68d075a3fbf52b34f43d3b2c334
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 17300 bytes
font_01_sfnt_off00011724.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11724 16792 bytes
font_02_sfnt_off00012f3b.bin
7cb72514a64ae0ed215e08a745f8b400e29049c0fba00a3cd9651a9a425bb304
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3B 10284 bytes