Malicious PDF — malware analysis report

Static analysis result for SHA-256 c106f9eb294a129c…

MALICIOUS

PDF

86.2 KB Created: 2021-09-16 09:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 215423856899a2e1e3cbc95b52d7fba9 SHA-1: b5b30df6c3f9b3961d2829bbc5fe1069dfaad42f SHA-256: c106f9eb294a129c62de8f46c5e337bfb9a3f46503cbc1bccfa79d3f6b57fc4e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to drive traffic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=phone+volume+not+working+android PDF link annotation
    • https://audit-advisers.com/userfiles/file/96601127629.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/98717813708.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/ruwojitugezamun.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/40138497540.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/78894226003.pdfIn PDF document text
    • http://soupworld.de/upload/file/tojubeludaditiwijamizom.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/87129733386.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/b2194f1eb005762acbf91eb8788de1b7/xipaxotijufuzibeno.pdfIn PDF document text
    • http://lejonhund.com/upload/xigibuv.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131227d22961---59613341019.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/tuvibemim.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/nofev.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/72550676739.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/43repup10q716pv4o0kn6tq0hn/sopobamerimoduje.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/ximid.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/0c926c6dd34608f1df696e28a5611ec0/nimovifuzuwegelewukel.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/didisixosunizulokezaf.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/96659134164.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142cfb231b60---77837369428.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/tuparob.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/39272010570.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/woxowadebako.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jri2qmrnc25abc9ki87j5n8de1/bodib.pdfIn PDF document text
    • http://kahasat.cz/data/file/41370431491.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/ralopomutiwa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1B 17620 bytes
SHA-256: 04001c8bd61f702bd330fca138ce1410900bc4d1e4147d1df2ced61d0475d91b
font_01_sfnt_off00011a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A39 10872 bytes
SHA-256: d718ca8721c4a92a97679c9a6d5e2efc22c826bfd6e58791299fd11f35e23a25
font_02_sfnt_off000132f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1