Malicious PDF — malware analysis report

Static analysis result for SHA-256 d75d8c879f34529c…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 16:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3e0365bec28a7432d7fc6154c6c0a207 SHA-1: 952b8387f75de32f925d146d6ab468cd1c41a3b7 SHA-256: d75d8c879f34529ca1da20e99b6ddf714bd6cd42599e1ab366400694ea1150ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to phishing sites or download further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are hosted on disposable domains, a common tactic for malicious campaigns. No scripts were extracted, but the presence of external URIs and the link farm structure strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://pixomot.ru/uplcv?utm_term=google+translate+pdf+korean+to+english PDF link annotation
    • http://myapartment.de/web/editor/files/wegitumigupafevaz.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/vepesen.pdfIn PDF document text
    • http://watch62.ru/files/files/48311017652.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da18d42bac---galurenetukidobus.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/n8kskefa1uivupvcstaph3tt8n/fivurevotazavixupugupoz.pdfIn PDF document text
    • https://kimansion.com/uploads/file/51473913005.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd1ffd4606---fukeduzelubofi.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/luh02pc2tf13qiecfkrb1oojtn/wipagixuxanizopiga.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/jilabupusebumegobolama.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d09fb61916---85237157926.pdfIn PDF document text
    • https://oasis-travel.ro/files/zisavikalivozil.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/79981629315.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/mqaf65nq4kvdamrdlod1g4g7p2/fakekafedarepa.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/63633270245.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/jidilezuwowusalezanejaxim.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f630e2fc38---zobaganuxusupip.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607488ce4c1ff---xisipiguwarijuposibudeji.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library//File/48633247322.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/93312209282.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/50546060946.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/58888411564.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_off0000e3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F0 10908 bytes
SHA-256: d9a13de9624d50dac672b17d8c4ea2d0793a6a9bbea1308580cbb002f3546611
font_01_sfnt_off0000fcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF0 17972 bytes
SHA-256: a7bfadab8d9d90f32710c0f84486360e021643304aadd1755f06cf0295c7f68d
font_02_sfnt_off00012b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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