Malicious PDF — malware analysis report

Static analysis result for SHA-256 516ca3913c60393b…

MALICIOUS

PDF

89.8 KB Created: 2021-09-11 03:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5592bd65b6afd8121fd0891244ffdbe0 SHA-1: 34e58a059cf569bbc5d0e286ac73d7d35e3da093 SHA-256: 516ca3913c60393b9cd53df8d21a0d106f9afc1bb3fe4bef4f0ec640451fc81c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis confirm its function as a lure to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://maffart-guy.com/userfiles/file/85673177224.pdf In PDF document text
    • http://daehnfeldt.com/userfiles/file/75000841379.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/1n68g34b0gg7qn1krbl4771dfi/96766366972.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c9878a3d9666154ef6289ad692830d18/47430340727.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/zupefubopelelo.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/9639537457.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/34289347356.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/dijewijanovekumulefarutut.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/62472292664.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/29969962037.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/bevuvidotimabiwabore.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368ec666650---58635025602.pdfIn PDF document text
    • https://mar3ol.com/Files/files/zavawivono.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b88b3cc2eb---50140564750.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/11761195537.pdfIn PDF document text
    • http://gad-elhak.com/userfiles/file/34706980593.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/seminetiwogobam.pdfIn PDF document text
    • http://rc-modeller.se/images/file///9937792265.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/2662572967.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/48728598086.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161309a7b5b645---fosobojefumuzerad.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/defelusimonosob.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/wixuvulowewujigoviguvomax.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/tetuluzabi.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/98903920181.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/bexusafevamazezes.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/91900947486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=wear+os+watch+battery+lifePDF 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_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001101c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101C 10660 bytes
SHA-256: 763c5df273602b22018191539654c3502895436f4006eabb3614ca57bb053c83
font_02_sfnt_off000128bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BC 18868 bytes
SHA-256: 91ad0a3c3b7578b353ab85815bb9fe38515a8e842ae7fafa479116f55a80f9a4