Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9b540baf9a45b1…

MALICIOUS

PDF

93.4 KB Created: 2021-06-25 18:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7df5bb338d93e2f9c82478d8dd9693a4 SHA-1: 98cb34393e121d351fa7be57cdfafbf38ab17d79 SHA-256: 8a9b540baf9a45b166c51c5b43d29dac1d69fba0dfc21d85f828d4c391d55e4c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress sites and others acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm heuristics and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://ivanamihic.com//files/galatuk.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607ca653285d5---vufunewubolodetuzalisava.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7p110i5uu4triksg5pvb7affj2/68323594050.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/e97f3d8d434f14038b1ff24f3025787d/375986538.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/26b6cbfa816015e877f819a6ecdfc3cf/wugujuzopikiletadatura.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/243f4b2cb8e03c34b011f5e350c2cc35/60171035894.pdf
    • http://aimic.com/userfiles/file/63845091047.pdf
    • https://ancoraeducacion.com/images/sifasokivedope.pdf
    • https://lesura.net/userfiles/file/89363754969.pdf
    • http://gsmontaggi.it/userfiles/files/kogubineratuzenoladotemi.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963b381fa7d---xiniresalotemixugaka.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c19fec99328e3ce1800eaa7f0b6e5706/21161192613.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b18ef4cdb3b---midusizobawu.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076b53e9696b---gidego.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/a0d386ac6b36aa5a5f16884bea607d6e/gozivazavazozugupegovebab.pdf
    • http://blevy.com/ckfinder/userfiles/files/sewanoxozasutevixol.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa53d6f98c---801010022.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a011deb3f---kijobapaberuzexajiruvalel.pdf
    • http://jr-bang.com/uploadfiles/20210619204717.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0585ab692---jatolaxosexutegajep.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076389aaa929---lunoxosumaluwimepobuvawid.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/afdc7b466b9a8084e97e5dc15ae8c7e6/rafedunipuxiva.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=epub+to+pdf+converter+free+download+for+windows+10
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014c7a.bin
8bf83ce1149695f34790ff5e95600f1c7cf3875407c88d74b23882da0cc37b78		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14C7A 17704 bytes
font_00_sfnt_off0000ee23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE23 16792 bytes
font_01_sfnt_off0001063a.bin
b11ece17902297978559e2210d86f91dde244b55238d027d8cbbfcb78a39088e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1063A 11164 bytes
font_02_sfnt_off0001204f.bin
f74365fdec707d9bbe95cee436eef6584d1591ef89a85ab6e00cdbf0edac738c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1204F 16960 bytes

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