Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdc3731bb796c7c…

MALICIOUS

PDF

74.0 KB Created: 2021-07-23 18:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89ebc1b6319d1a5edefbad77f31376f5 SHA-1: 8ac8e23942474175a0f10c6ea82d93aba8985558 SHA-256: 7bdc3731bb796c7cc332c24fcc023ed62bbfc8cff0520795eb085abd6092cc76
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the structure strongly implies a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://julianowka.pl/ckfinder/userfiles/files/bazedumipowisazore.pdf In PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b97bc8e4a08f140d1ff20d0a1bd7f5a3/majuwisegok.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/63d406cd713ca3050be6cb14040dc982/jivif.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/13fd40828307f3cc77d39b2104fd7e2c/toviluvuxurugerenapa.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f420dd0787---97528691884.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/mebadowolepasibewe.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/vumuwikovuzuj.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/jididoliwozimubimugudiz.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/45593981afa502cb1f541625442295ea/venenew.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/gejizaxa.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfee8a31e5---44642095014.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/88092393901.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608496b6c1b4f---55993457003.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/12647673380.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/tipibiritudaji.pdfIn PDF document text
    • http://hotelhoanggiaminhchauquanlan.com/img-kskc/files/bodiwilene.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/99326428501.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/vexixakubagotuw.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e4b6767a660e5b95827bdff264c9b95d/sipeginiziwuxugimedolope.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093adeb5ebd7---vavokeziravaxidekob.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/5d031bbbace7e33dc0cb8c6b7e405d7a/87769318199.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/43098666520.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/hi4lik5itnmvcdbe575045i68j/53463754215.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea7f89fb0f---gezaxodilolufivumoxulufow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ram+chahe+leela+mp3+songPDF link annotation
    • 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_off0000bf0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0C 10748 bytes
SHA-256: 7c797a3bc742ad2933accbc319195b696b011ae2f318fbc0c3d067ae9834f758
font_01_sfnt_off0000d798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD798 16776 bytes
SHA-256: 0be2ba41e746361f6b85cdd312679d03dfe18824b873dd4ac3803c3f0e0ff28b
font_02_sfnt_off000102b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1