Malicious PDF — malware analysis report

Static analysis result for SHA-256 5edef7f8257df64c…

MALICIOUS

PDF

93.5 KB Created: 2021-06-29 04:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 532ddfd06fd43ac609a9363088694b32 SHA-1: 6d60435ca7403c23a24baf8dbe6a9ab6d6feac8d SHA-256: 5edef7f8257df64cc447eff00b7c3bc8d4e6b97b57aed23b3f05f9bafe573dd4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bodegoncriollo.com/userfiles/file/21343597457.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828099e8700---62906495298.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16072b9ff50c3a---35422938068.pdf
    • https://hopadive.cz/ckfinder/userfiles/files/tozupisekiduvota.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/6r2asaf4qtss5bmv7f5hvna82s/52743284346.pdf
    • https://rajaunited.com/contents//files/34564635880.pdf
    • http://poongdung.com/FileData/ckfinder/files/20210620_C82A949A34164B1F.pdf
    • http://cs-golfclub.com/ckupload/files/11960808241.pdf
    • https://charlesstreetvideo.com/userfiles/file/59972062672.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/pm5cht8ij8iqt37s9lfuhk6sa6/70130486907.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/484da123301532164a8ecf4180b7df18/xixivelukon.pdf
    • http://cafemsoffice.com/userfiles/files/76517624327.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/r01v95rbniciupjtnsvfmef9du/xaropalasewafu.pdf
    • https://meesens.be/KrMee/Tekstverwerker/wepowil.pdf
    • https://equator-maritime.com/userfiles/file/nugijokirogusetob.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/23090478077.pdf
    • http://conelser.hu/fck_uploads/file/surorafilukewijun.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dbb87a17a---40562584985.pdf
    • http://gopherandsquirrelcontrol.com/admin/images/file/65152262675.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/fd6a4b9a9b83f553aab0da49d3102657/53926501676.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/31fa4d421a1386f859aff8a330409390/32642968980.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087dde82f1bc---42662608066.pdf
    • http://hilltop1976.com/clients/24685/File/gezubebuvuji.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609571add186f---xuxirakufufitivesuvegodo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=simple+soap+carving+patterns
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A06 16792 bytes
font_01_sfnt_off0001221d.bin
b05854feaca6859a2431b275ce800d7e05ac5ea1865b25f484abd8377ffee3da
pdf-font-stream PDF embedded font (sfnt) at offset 0x1221D 10856 bytes
font_02_sfnt_off00013b29.bin
8a5ecf8ada2f993771afca5c5e457260045a7956b337c70f3bd8ebd964e1dad9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B29 17792 bytes