Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb11ba1d55f4fd2f…

MALICIOUS

PDF

85.8 KB Created: 2021-06-26 10:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7a4e17f23f57fdc8304791e980f4662 SHA-1: 6ea6cb5412d6cc3afccba4476b14b13012391dec SHA-256: bb11ba1d55f4fd2f5d26da320e4b686bdaec7fbdf9041d01742d6b023ec00528
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=fallout+76+leveling+guide
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/5n782uhl2fgmsaqc10pd2bqd87/38088039092.pdf
    • http://asesorgubernamental.com/images/file/zutovezabenatipu.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f020aa49da---32278428995.pdf
    • http://homenet-spb.ru/userfiles/file/kadofunowalaxobaxanax.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/9000920e7b786a3f193e5ad01e3af8cb/fuxaruzixugivimav.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/49c090e6428f3a11de6dbd8ea9effd47/50597789390.pdf
    • https://harvestrain.com/wp-content/plugins/super-forms/uploads/php/files/35db359269b6ec0061f527faf12c7650/37312744013.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/u5uepdu5hlmbo0lset8a65u5hg/numegoweka.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afd002b5736---duvataxolodug.pdf
    • http://hainescentreasia.com/images/file/19585304307.pdf
    • http://i-daa-wl.de/userfiles/88641600718.pdf
    • http://bbfederico2.net/userfiles/file/komigodo.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a9c0daddd---91975025671.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/b1f5f6d023c6468c139ecf4731c59544/31270108087.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/277f93d3c583447c3f2ca4971daabff4/filuvimuvobezepujel.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2b8c6d221---94390138832.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/oe3qn667n9sgim826fo96l06d0/68825506397.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/dk27lqrj23mrhcpckv2lmltuo8/54368809815.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fdbad1948---84595865650.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a1750bda4---49695678329.pdf
    • https://iwnta.com/userfiles/file/48747229913.pdf
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/4038128591.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ad916c4ef85270ea71b2391b4ff1c805/zotofamoketowofe.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3cf585e56---zutufewejox.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_off0000ec2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2D 16792 bytes
font_01_sfnt_off0001043f.bin
49c26a8d437a98c3c54fe9be76e4c8063a45f83421784d3c21a8d9f59d6deae9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1043F 17040 bytes
font_02_sfnt_off0001307b.bin
52bfb572f9fb345b2df61cdd4e987e7bf9e8ab67d98f586749747833d67f3aca
pdf-font-stream PDF embedded font (sfnt) at offset 0x1307B 10516 bytes