Malicious PDF — malware analysis report

Static analysis result for SHA-256 955d0d6caae6271f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 05:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f632582af7ef738a2e585a158eaa516a SHA-1: a76de10b43d434eab3cb9c8ce4ec19ccac7ec44d SHA-256: 955d0d6caae6271f88ddeecf0dcc1f5c89064b30391d7fbc8b6e274bf25ec7cd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm on disposable or compromised hosting further supports its use in distributing malicious content or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c009d080b61---zogizek.pdf In PDF document text
    • https://senfina.top/uploads/files/rodozenuvudifokosuzeriso.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/95821714522.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea70daa1bc---buzuwagimatofaxokezawagex.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/75851525971.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/vewegidetukilonar.pdfIn PDF document text
    • http://rafaelokazakov.com/file/milifekiribejaluwejit.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/serowure.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/fosijit.pdfIn PDF document text
    • http://whitepurdeespires.com/clients/b/ba/ba703c466af5784ee38134b9d09df413/File/midej.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/24930996596.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/qalao6mqs018ht05vlgnav9hg7/jewiworoxivufuzawupag.pdfIn PDF document text
    • https://medpressa.ru/files/file/judofuretapodunuvoluvo.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/51846400571.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750b559e03c---tuvegag.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/agnlqffjrr1uhm7iugecbjnv2o/gafasowiwovarenur.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/p8270aoiq97k52m236lt76t7a6/25409644903.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/nesilawasakujexipugi.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/wazidewarod.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/27106836454.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/290aecb198bd5119144049b5c9f0a080/roxanitolofoximegotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=electronic+drawing+symbols+pdfPDF 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_off0000d45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 17720 bytes
SHA-256: 86607b20b09f0edbc9295f6e4d852bce0f7f74a69472322afeb2862417cc54a8
font_02_sfnt_off00011a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3F 11284 bytes
SHA-256: 7d2515282409ad7ad298dadcf7cf8e5d7cfaf1e60a0357f524802c9e4a5ae19c

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