Malicious PDF — malware analysis report

Static analysis result for SHA-256 8490e37846b812aa…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 07:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1cb2a54275d70526d9eba55b18e3041c SHA-1: 50be4034d330f69681bcfbac4a39d2082d234d74 SHA-256: 8490e37846b812aa9a0521b3dc8920368d6901167eeb54a5a7347a86a2fa636f
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm patterns, indicating it's designed to redirect users to potentially malicious websites. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://archism.ru/uplcv?utm_term=figury+geometryczne+klasa+7+sprawdzian+pdf+odpowiedzi PDF link annotation
    • http://heatherjansch.com/ckfinder/userfiles/files/17475161890.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6950af2af---bajirabuguwamejonudim.pdfIn PDF document text
    • http://forti.in/userfiles/file/95156222366.pdfIn PDF document text
    • http://ecole.ru/text/images/file/tuxupomasujo.pdfIn PDF document text
    • https://mihalex.by/files/files/7175587180.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1dead0abd---mufawomagevitowe.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/10913899597.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/82325834372.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/16486083425.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f585e232a---fejovopodizulijulajup.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/743134f40f50d7a8ef5d8cd363383a91/46463026394.pdfIn PDF document text
    • http://satbietthu.com/luutru/files/90602601851.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4cbe47362---zuvebuwikodobewu.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607275531ab45---61330493234.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/wixabi.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/jewirigomevesit.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f57a8505f0---49614223168.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/sebafopexibuwagobariko.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/lajubogejopuserezojobad.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/nizirapugijusol.pdfIn PDF document text
    • http://gdaniec.com/upload/files/21824923377.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/1agq06vgifs8v40kg5puion5j0/47891197955.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/wedakajaxodunexofo.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/qmru947qqubahrrm8omegm282r/66105603473.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b19d6a916---89974411187.pdfIn PDF document text
    • http://feast.to/upd_file/sapatusobuw.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_off0000d73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73B 18592 bytes
SHA-256: dc578a494ff2d0b194de2429b9e33252b9018ae978a207df8f0a41137104e8f2
font_01_sfnt_off00010778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8F 11444 bytes
SHA-256: 13987d7c3267eab52ffc66db6a7d653db5f01d03fa7d039097e7041f372827a3

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