Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c79f422ca47f50f…

MALICIOUS

PDF

86.6 KB Created: 2021-07-01 09:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf5a11c5e844f8eb2e9ac70b77a84584 SHA-1: dbf98e079a79f99f90c9d41c4ba7abccb8099014 SHA-256: 5c79f422ca47f50f76add0a22164f82a666db2aa38067facdb2c0b17028b89b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malware delivery or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://portugaliaimagyarok.com/ckfinder/userfiles/files/rupag.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086750909dfb---rakosapoduxuzamilunel.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/d43c62f2cf610119d1d219b574bcc56a/lubenesosugubigolavalu.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/720e5909d957231156e62e2e962bab82/9970832424.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bn04crgf4m2vstt5gjnd4lish5/gaweberume.pdf
    • http://ajisushionline.com/uploads/files/pojelupomevus.pdf
    • https://ceccarbotosani.ro/userfiles/file/98325988393.pdf
    • http://kirilmazbardak.com/userfiles/file/62950451063.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/k3nu0i1qufvhkn6agcd6sdq91g/42831791679.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16089f4a479c65---57737899235.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/4ea61e454266144d3c17780c12af8195/31144826370.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d54201b1ff---betibumilik.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e10c1a93f8---penoxokusositikizemar.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096214732010---nafukekenitodomurepe.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/n3971gon7lcjejb2h8n675k6e1/32657752654.pdf
    • http://tribo.kz/userfiles/File/94530246512.pdf
    • https://recapress.com/ckfinder/userfiles/files/63403880750.pdf
    • http://nelly-design.ru/upload/files/xobiwutagidisipovaguved.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160beee260916b---badogamakopemur.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160dcdbc974cdf---42699289722.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e507429af---49988522657.pdf
    • http://ylpcl.com/ckfinder/userfiles/files/zerire.pdf
    • http://itkaufmann.com/images/fckimages/file/mevagob.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e320a49a80---wenametasemakep.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160841d594fb36---fubavafunot.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=witcher+3+blood+and+wine+how+to+get+the+best+ending
    • 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_off0000ef38.bin
eb1d1472792ba36bcbd207763727d05939339b5df6181dfa3b04fd6c5c42f65e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF38 16804 bytes
font_01_sfnt_off00011ae8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE8 16792 bytes
font_02_sfnt_off000132ff.bin
5013acac87546f7a3e432d285bf55d8df3042a8ae6282def0ad826514e57af00
pdf-font-stream PDF embedded font (sfnt) at offset 0x132FF 11040 bytes