Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3ae583875f048f…

MALICIOUS

PDF

96.2 KB Created: 2021-08-13 15:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c928202added5071954a0770ef5b26bb SHA-1: a16b3c50bdc2a9ac8b9d3aecaf380272dcf84710 SHA-256: dc3ae583875f048f3000688898e8e58d47a955a9831d6b10e5c299b9ecdcffb6
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to PDF files hosted on compromised websites. This pattern suggests an attempt to manipulate search engine rankings or distribute further malicious content. The presence of multiple links on potentially compromised CMS upload storage indicates a coordinated distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://delphin-restaurant.com/ckfinder/upload/files/94645374446.pdf In PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/lugabomenobevapivadu.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/lodelodimikutorumajos.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/dofolosuvarevotagamiwupol.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/334c4491692be1daa096a484417649e6/subotenexekugopa.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e87718206---19611836098.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/88861024895.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16084c7c2eae99---90657138829.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c703c71398---lobomalivawapax.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/3gb9kk0tvoi86ervm5m43rot0h/dirusagufivedo.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e58f9e2efa---nitadirupebovutiso.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d34d6c3eb16---fubuxajofaleluj.pdfIn PDF document text
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/10082911408.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/54aedd85b9e2121d0e7bda69d135502e/jagedenazebetim.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d98753deaa---mofenajobevavubevoxexi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a1b2ef1252318c0e42cce4037551e99e/lotaterujub.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/24a5a422bd82a1f4aa9099428cbb92da/63535724191.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/53369237778.pdfIn PDF document text
    • https://sinarwaja.com/account/files/9192802296.pdfIn PDF document text
    • https://promise-land.com/upload/file/36267190017.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/hccukjgh5gr9su9nf2u6tj5rit/duxivazowiv.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0b76e722a---morifosutij.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/jixozufefazojuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ejercicios+de+estructura+de+lewis+enlace+covalentePDF 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_off000110d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EF 10728 bytes
SHA-256: 24612463801250cae29d37f29012dccbe5ff813c6a9640d2e3ef14e5b78cb3d5
font_02_sfnt_off000141b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B1 18256 bytes
SHA-256: 53ca788170fc101204f93505fee29c7c241175bfd67895588afcbda6baf52956

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