Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5140aa989ed2519…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 09:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c8b2a298cd7b43c3f64360e44a5a8bee SHA-1: 00ff7e9f57e83d666de55d3d461bb4f7437ae544 SHA-256: f5140aa989ed2519d04c58da8ebd14a2ed23ab682214b159392365b4b22a75ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The presence of these links suggests an attempt to lure users to phishing sites or download further malware, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161218e8d86384---46980631443.pdf In PDF document text
    • https://digireg.gr/upload/98215319199.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608467c18c2ab---53667504050.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/e28v2jnlj5t2ieh2ojn5dbhsgn/89482519144.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/govibiwidigadopagupat.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/46cbac9a47f99b0d0279bd2efbfae2f1/pajiwerologo.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/15687782678.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608013e94d981---zitoxe.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/40273137754.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/958c834889c24dd915b0326e3a14c9e1/nojupejezipuwoverowesef.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baecd9e3c0b---50366679581.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/69ebd41ivh9clgrnefo58v53gg/nawiwimefotijixovizu.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72067b879e---22168830108.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/40485410984.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/8cb1f4c8ff60e3b63f255182ee1027b9/97802871848.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/7472d0edda0c9b6328d01c433fb34c1c/xobipoviwemulemokonawar.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/45105688127.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c8139bf02ac9b000b02e17b829b129ef/lufixejudivom.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/roxonin.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/6brsn06q20lla54i7c5p8bm8n4/vetusesaladot.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9f5abfe6---sakorefuparus.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d67c079fd4b---jiburuzolexukitasive.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/a368b5e8fee3990f3f97829e5d661e28/97850377060.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/186e438fabcb0ad8b39864b6b4263d6e/72908242162.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/mivuribu.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/konosezegabuviv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=perpendicular+bisector+circumcenter+worksheetPDF 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_off0000dc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1C 17724 bytes
SHA-256: 8b2c9e148618a075cd93153f3d72ed7ff3fbd6dc88831a7765f07eb534cab8c2
font_01_sfnt_off000109ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FF 11196 bytes
SHA-256: 940a77f645dd0aa3199957451e6fbaad39a1780ed5cff596e6da282ca29d876c
font_02_sfnt_off000123db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1