Malicious PDF — malware analysis report

Static analysis result for SHA-256 84defcc2b9fdc502…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 18:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fa61c0855453a8d92534fa83e11fc134 SHA-1: a3025fa17eb60835a9b4cc146728b4a1660e48fe SHA-256: 84defcc2b9fdc502433d7512322ad17363a69271f984fbea5e937559d58ff936
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links to potentially compromised WordPress upload directories and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/eb945b404249002741b6d05dccb1afb3/rusuvejovirisemu.pdf In PDF document text
    • http://www.szphotar.com/admin/img/files/97447169666.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/42165688276.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/marabutajukuluramominup.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/av8pln465qsojhelr9nrrodnhk/retutitexejaromubar.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8a85ec5ef---ragogi.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/72522455333.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/rudafefalawanidobaziba.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/3569282621.pdfIn PDF document text
    • http://labonscafe.com/userfiles/2127817497.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/l63tbehtupkbgl49v07n103k9e/giremusumajek.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/fesigatat.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/b6e6388040fe7b4ffd893f82622bc00d/6874698668.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/manumobonafakeg.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/peniline.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/divox.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/18911431373.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/vupakisosixal.pdfIn PDF document text
    • http://0851gay.org/userfiles/202107file/2021071000520970554.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/37ad8be4964efa5749dc9cffd4f43696/redoremozidokewo.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ead3802d32865714f58eb8a78c78ff85/52311034305.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/sadis.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/qi7gaeksvv2bj63isi3enm4j55/60095213495.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/fd08bd951e8eea5b9ab67984953c97bf/93290357286.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/nezoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=honeywell+rth230b+thermostat+owner%27s+manualPDF 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_off0000dd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 18528 bytes
SHA-256: 711eaa57ff1145bf9ca53cf400e18f4cbe825da03326b0b58c4a18ac79b9c235
font_02_sfnt_off00012538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12538 11160 bytes
SHA-256: dcca3d1a0ae85773026277bd441d56670e964aae604112b5f3111b2a3bb406de