Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9de8b3075e2930a…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 13:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 54101ef0801d2b7d5738e8ae6c2b8aca SHA-1: 1bf80a3cd9ed25dd9d5c3875473476182df46c63 SHA-256: a9de8b3075e2930acf8c1bc6857f45581b6e2e11780f781c5680b77bacdeeed5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=watch+my+hero+academia+two+heroes+free+online PDF link annotation
    • http://mueblesdepladur.es/1/userfiles/file/19656204099.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/3168505325.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/90717860680.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/80jgtrsmaj98l0m0qr8fthk338/wopasataxisakatola.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/fogaloxadasaruzonu.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/tufex.pdfIn PDF document text
    • https://amityhr.com/userfiles/file/16718385330.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8a1b28703---63296951238.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615145fc71440---vizivugeb.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/gezuwesejekawoxuzesar.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/9k6nqirsnr4masb331kh1e0hp2/92742961183.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/lemuvilitukaduxazaj.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/67283301998.pdfIn PDF document text
    • https://redormiga.org/sites/portalin.es/files/file/98106864387.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/temimisizubazazoriz.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/810bb70ddfbed5f1b9f8eaac9d4b6382/joxijemamamog.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/dulabetugud.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/sitanabi.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/vitanamizezologenawar.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/vavolafokuradoberegewon.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/kolaw.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/kolivero.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/ladejiditovimujavetifo.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_off0000b292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA4 17136 bytes
SHA-256: 1f54e38028cc090a07d90d19023356001d5babeb35ee0939f1156346a0e264d1
font_02_sfnt_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 10932 bytes
SHA-256: ad7e893116dd9abe333d0fe8f4dbbe2e7bdc8866e3c1057f06c0888a21f26a51

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