Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a6a4624175e25b…

MALICIOUS

PDF

86.4 KB Created: 2021-08-23 14:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5745295a168b58663f9bde9da5cd80ae SHA-1: 22c2d34a7c9c81eaa3ac13661cc98c3e1f57c98f SHA-256: d7a6a4624175e25b04d16dadf0533fb3c80e4dd7532d44a7169edfa6172b8520
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised websites, many of which are hosted on WordPress installations using form builder plugins. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The document's structure suggests it's designed to act as a link farm, potentially for SEO manipulation or to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=woodcutting+guide+osrs+f2p PDF link annotation
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607313fac58e4---wugemorunala.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/gobijulujigunokenexu.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116803c38448---zidekorilom.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/zudolomovokataxebixu.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/nifamokixi.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/88607528086.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/uell56kii60rbli4mtjgspa693/wepawosamipudufovetag.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1bf4a78cf---1676060097.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/rubofabukivotiz.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b75a5635e41f66ab702e5630949fbd26/54470260469.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/79012941357.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/majezejibafab.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbedb776915---fefevenubunijesafeguzak.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/qohb40jjv7ti4gdnpob75j6jn0/lulopufokabokaxitowiwija.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/42244208357.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081e1df63946---zazewisifekosatefabo.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcfac41610---21872132935.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/56319822221.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4ff4244a---75976748102.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/80102240492.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/5562c56afaf8a6647e57ba7df350d21b/15742146471.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/54588281760.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607636d2682d0---34092947193.pdfIn PDF document text
    • 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_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 17232 bytes
SHA-256: ad814a7bc903c55724da5a84eb391165eae6c96202a9ffdddd873e30d992b909
font_01_sfnt_off00011b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B27 10800 bytes
SHA-256: 0d18ef5e1aae0f882df22a745da0e4e53cc6b002e11b76a68e7a52c2a0638154
font_02_sfnt_off0001340c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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