Malicious PDF — malware analysis report

Static analysis result for SHA-256 508e961aab1840a9…

MALICIOUS

PDF

88.2 KB Created: 2021-07-16 00:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84b3e1442bda0ca701f4464f163e1acc SHA-1: ff38fea52725067e7f0e33c022ca5778b5259fd6 SHA-256: 508e961aab1840a95da8f976322a223d447376e7afa6b1ea7d4325d4d34c103a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2efa70d0d4e233a35cb5bb3c993e7e9b/vopar.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/d94a8a573573dcd5fcdcf33fbdaa1e14/vudinorak.pdf
    • http://farashimirooz.com/files/38270631624.pdf
    • http://dichvu12h.net/userfiles/file/67864163764.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ede33d36c---61924029724.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/da372333333e750d3690c20b16d4d591/dejazivaxi.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6c2b325aa---jobudozexomam.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d79c525dbcc9e5cfd218124af2c740ac/1610835087.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/tpq6m3qdk952tacro98je5km82/14380471157.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/pn1gr80m5gdimejth6jcv490a0/16660780637.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a12d2de33b9---49252716676.pdf
    • https://vico-domrep.com/ckfinder/userfiles/files/52340764871.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/acadb1c482b79966c7af73075009404d/povel.pdf
    • https://emprenderem.cl/files/kitekinenawu.pdf
    • http://tuanayapim.com/rsm/files/82316355049.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/rbsfto1vidb2eeg6qp4o27blqe/takoz.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4403209b7---98238599528.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/4fc599499250b42b1fc05417bcd833f1/96786269153.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/88e6tm11ttr6knjfigjgv2p2s6/80088417932.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5kl5bgk0s10b8trg1h1v3tbflf/75155819846.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a383279fc0f---97421021296.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dde9d5f3982---lurejon.pdf
    • https://autosaloncenter.com/uploads/file/41481657734.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=upsc+toppers+notes+pdf+download
    • 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_off0000f1f3.bin
aeef9f9c9285521c9ede881ff34be9fa62dd16551773d139bd3f5e4227006c2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 10616 bytes
font_01_sfnt_off00010a6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6F 16792 bytes
font_02_sfnt_off00012281.bin
b6800e662fba05e8a295598d33a182c383f1f9556dbb5e12c7ac58becb7f4cf1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12281 18736 bytes