Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe70a54a282974de…

MALICIOUS

PDF

88.5 KB Created: 2021-08-25 13:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 744dfa6b95f6e3c4383b68cd25cc6317 SHA-1: 677f54c0cd2b2e433306f8201dfe6661d2f30b88 SHA-256: fe70a54a282974de8950eae577447452beed156c46da1b5c350e1e93fe53bc55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and a link farm heuristic indicates the PDF is designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://oniceh.ru/uplcv?utm_term=don+moen+praise+and+worship
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/f7b865e567d7e9ae2d90913b65dc6ff0/bazipixadeja.pdf
    • http://micdelhi.in/userfiles/file/78130335281.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cddabc72ace---15192738243.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b844e159415---zaresipisupesujozo.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4c2c09ec1---roxaviti.pdf
    • https://x-leather.com/radsportfiles/file/22985553700.pdf
    • https://consurs.ro/ckfinder/userfiles/files/5100190003.pdf
    • http://gapoom.com/upload/fckeditor/file/wabafozumilolejekevapasi.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161167a90b8332---29858235934.pdf
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/lisomagituxoxubelogibum.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096858254cae---90010515270.pdf
    • https://xo-sound.ru/userfiles/file/58389241093.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ltsbvup4s12as0oocan4omvlb4/15177404934.pdf
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/61925917520.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d42bafef804---25633817056.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7adfb5bc6---61634066430.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/cceb41f052e690ed6656a3b7e5bd23cb/sawuburakomebaz.pdf
    • http://rolmech-strzelno.pl/Upload/file/zapozitisusixis.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/cbe8aa4da91a972669361ac0bb32ccaf/74080633125.pdf
    • http://bdaudit.ro/userfiles/file/vawifovapiwepobitagapejix.pdf
    • http://utuin.net/files/fckeditor/file/25366135842.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/cfsu977rje3hinlmrtvra6aehl/pukuxonosasevuduwep.pdf
    • https://kozmetikadunakeszi.hu/userfiles/file/32458222449.pdf
    • http://strap.sk/uploads/file/91068717117.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/baljj83kpu2t0u0cm3hs04mjb0/41001810793.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/872e7a145360f59e32ad2425c7c30398/widivesanusebira.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/4ac7d54ec92c304891e3854554f16a59/56431218396.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_off0000f744.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 16792 bytes
font_01_sfnt_off00010f5b.bin
5cbe49581d7ea12428a2f8fa5f0f34b60b9af9643141198d48c51dab1d112fda
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5B 10600 bytes
font_02_sfnt_off00012752.bin
303f7046cee4d37934fc267708cae02b90cad88b7fcc93abc9a75c98934744f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12752 16996 bytes