Malicious PDF — malware analysis report

Static analysis result for SHA-256 36fff42927697a6a…

MALICIOUS

PDF

122.0 KB Created: 2021-06-29 08:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f28b9f92c03937c5c11f81c5c20cecd SHA-1: d88a02ff1b19991ed855b4224c732910c21fd3b0 SHA-256: 36fff42927697a6a252b2bddfa5b63d31b5b6ccd0312193c685f7a14658a6f18
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://drafthe.ru/uplcv?utm_term=disadvantages+of+mergers+and+acquisitions+pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d246fd83222---nitobibudotef.pdf
    • http://hayatteknoloji.com/webimage/file/nuwomowapanodub.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c458a68562f---70608096264.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/rec0c50a5bbm7mal397iee7h9d/gelike.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608eff3f68158---863406234.pdf
    • http://www.aadhar-interior.com/userfiles/file/bodejarovizatevavitamupe.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/vruaoao9fdluk809n5pb5puk9r/42033750945.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/pc0esbqe6p8an8mgpa3988mi7a/47222794345.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b09837340f2---lineraxomagud.pdf
    • http://tasteofruraleurope.eu/upload/File/rebubafudulusidexi.pdf
    • https://reinigungsfee007.de/wp-content/plugins/super-forms/uploads/php/files/6f61rg7gimhuo571lqcjugfau8/jagibewitewugivotagomoxe.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bddde0b0b0b---jeranafozapexejugogatibij.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780d1cafa54---43716030628.pdf
    • http://hevolta.com/upload/file/64947234260.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/928436ade3dfe760724602a0501a9621/18206335334.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/7676a8fd53cf2c9a31f98f04ccd5dd5a/75949588921.pdf
    • http://sllight.ru/design/img/upload/file/99916405562.pdf
    • https://autoprofi.ua/userfiles/file/42600216847.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a752bd952---xagasorekigojisunaso.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/j15p50f4vvhhnuecccl72fohl7/xibupirifukotovirawuzo.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/ca1bcbd44995f7c534609baa2e70a963/9934808692.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/cea4f1b5b17cb934561373642212a9b6/xasixedasasewonapemaroj.pdf
    • http://bitite.lv/media/txt/122/file/zukuz.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b08e733f4---17484564144.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_off00017ab1.bin
a695446a11f36a4b65784d5f87df312ffc64540a2ef5f77438d36294552045e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17AB1 17292 bytes
font_01_sfnt_off0001a814.bin
6b45b1377e7799e636c841e06f0be75c762fba37f52e2d08d43b0f1ae6f5b3e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A814 11232 bytes
font_02_sfnt_off0001c1e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1E7 16792 bytes

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