Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd48d886346f4c2…

MALICIOUS

PDF

75.2 KB Created: 2021-08-15 23:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80a1fc8728c04762a75924dc2f8318a6 SHA-1: e3b92982a06343ab6eb6716065cd5017c6be72b0 SHA-256: 9dd48d886346f4c2358b6ce5daec71a45ad90414c58835fc2fe1e8babaf8b1d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a47bd27d2a---74092424315.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f0091c8a0---89680941102.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/1hn90cc1cn43ge83kmebt9uh4c/13949223921.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/53bb70acbc07ccfe0e7096aa66acc378/87422542363.pdf
    • https://lienlacanien.com/img_pages/file/zekomutaliletarerowubab.pdf
    • http://hamzalegalservices.com/userfiles/file/pewavuxabosokenadej.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/e7r23m2rae6qmd01k7qbhmvqog/dasaw.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/c74ff5896eb7f9f69416b1ce179d1ccf/18567946637.pdf
    • http://www.peretprod.ro/content-images/file/jafabebugebug.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d0131200076---molelonid.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/636b39799819ecf4010ca19a0a4f30c3/duralod.pdf
    • http://hamyarsanatco.com/ckfinder/userfiles/files/22268353881.pdf
    • https://alves.bg/ckfinder/userfiles/files/19144847477.pdf
    • http://dedanskecasinoer.dk/userfiles/file/82975425560.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608357194c2a2---monesedetesazejefov.pdf
    • http://taxilitomerice.cz/ckfinder/userfiles/files/viwivetonopunusox.pdf
    • http://foto-video.ch/userfiles/files/gaforogif.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/a6c3bd74f75c1432400fbba26152223a/29511582877.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de49677b9cd---nidorodibosaj.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609430f474f4d---kapazavaxinupuwilirixuz.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/eoop21883gf6lfrui2v6b0buv2/50247344207.pdf
    • https://ceral.pl/ceral/pliki/file/gugasim.pdf
    • http://gsemilia.it/userfiles/files/pufobunukaritixivuku.pdf
    • http://virtualcharityevents.com/vce_cake/files/files/katonoxomuserisen.pdf
    • http://kingbikeonline.com/images/upload/File/samixuvuxa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=subshell+electronic+configuration+of+first+20+elements
    • 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_off0000c54e.bin
8cec62205729c6b4054703701e512ed1b1e9349db4158d9753e0671f54228772
pdf-font-stream PDF embedded font (sfnt) at offset 0xC54E 11340 bytes
font_01_sfnt_off0000dfd3.bin
a9932be21dcfb7e73efbf7712ea66aa34ee91d761f1ba2931ce7e02317145367
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD3 14636 bytes
font_02_sfnt_off000104fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 16792 bytes