Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d5f62f8646cd9d…

MALICIOUS

PDF

73.5 KB Created: 2021-09-26 15:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cf83eb8e786b784ee563b9e138dea0d5 SHA-1: 796fe61f3dd247bff81369aae3fcbdb093bc319f SHA-256: 81d5f62f8646cd9d664f8babb312d3851005e5403e2a85742746119faefd08d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the conclusion that this document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=download+game+keyboard%2B PDF link annotation
    • https://calendarsunrooms.com/userfiles/files/95138492004.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/vorekuroxawafewamuve.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/bapenetefukuvifiseza.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/vibotarenapar.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131075c2b1d7---44639034806.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a17951f634944951ec1e658c23f618aa/sotafa.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/35174296311.pdfIn PDF document text
    • http://taxfreepoint.com/file/wisixivakamorokikomabom.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/51394602677.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/49817937409.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/wirerotufoko.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1aadfaab0f612f13ad8c5a343dba16ee/24684302905.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/94414215221.pdfIn PDF document text
    • https://krossi.ru/images/content/files/rokepidelexemipusokul.pdfIn PDF document text
    • http://tobolsk.fluentrussia.ru/img/content/files/zivaji.pdfIn PDF document text
    • https://norservis.cz/files/files/67875109539.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140035d04c7a---mozewisilesosigen.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7217de57a---35920445138.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/wibidetiwedepupexovopaz.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/27502937.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6174850bb---lukevogotepujolu.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/zobimuzasegetov.pdfIn PDF document text
    • http://svx.su/ffile/file/67833093098.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/xatidude.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_off0000b943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB943 10668 bytes
SHA-256: 40083775054db545448964882ce3a76602a444a06cf95b31f6b914f4ef20a609
font_01_sfnt_off0000d17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17D 18356 bytes
SHA-256: e70a551de37d12c7affc6a7e980d867c9e7f56ad835cc0e99c5bcac00d22c03e
font_02_sfnt_off0001005c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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