Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c87997c2f232c54…

MALICIOUS

PDF

89.8 KB Created: 2021-06-27 06:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ded95969afac58ff46c4ff665e8385f SHA-1: a7b29688a88e6ef4c9d7e2c4158f1b8e357934e3 SHA-256: 1c87997c2f232c54d07c39281dc9949cdb19e784d4dd498d4c826ace80e7c525
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://queure.ru/uplcv?utm_term=ride+captain+ride+blood+sweat+and+tears
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dc4d48e6f---96550296525.pdf
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/31054368388.pdf
    • https://energooptima.hu/upload/File/69123090334.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609da49392730---56483905576.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/suzutexilutemaratonawiv.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbbaf8431b---63227449453.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/08df9af9390caed2f73b4e5979f82a59/40905971032.pdf
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/dewexoronivitapubeno.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d42d8c805e---40161849872.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608703e689206---27480678977.pdf
    • http://zhengfutz.com/v15/Upload/file/2021641445453998.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9f8b56565---88333523920.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/96c021786541ad274cff4fabafcdf78b/tesatusigopiv.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8cbd852cb---28075212333.pdf
    • https://ewt.cz/res/file/75635016799.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/r06cdkllhat285b9pn676n7orm/85784603638.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b973bdd726c---tegirujerirudebuwoje.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f571b76181---misaremagid.pdf
    • http://ahcxdq.com/uploads/file/022206335173.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72dc66cb5b---26561252608.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c62f9d26e2---ferin.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/kubebajunutepisud.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_off0000fd32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD32 16792 bytes
font_01_sfnt_off00011544.bin
3df1f64284e9b4312feb6bbd5615c100eaf4af50f28af223b8cb1989bb79db01
pdf-font-stream PDF embedded font (sfnt) at offset 0x11544 16816 bytes
font_02_sfnt_off00014136.bin
dcdaf5e9573700065d14fd3c6c28333ab6ac9a274b7a3ef0fd0c313a7812679b
pdf-font-stream PDF embedded font (sfnt) at offset 0x14136 10776 bytes