Malicious PDF — malware analysis report

Static analysis result for SHA-256 350f786808f81b94…

MALICIOUS

PDF

83.2 KB Created: 2021-06-25 21:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8e642361af95f66a21da2a90dca78ca SHA-1: af2489a34265893c1b316b015187a10bc5a1fb5c SHA-256: 350f786808f81b94162e765594592eddc9af6b9ca74ea0435d646eacea2135ea
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that lead to compromised websites or disposable domains. The presence of these links suggests an attempt to direct users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://yucekalipmakina.com/tsrm1/img/userfiles/file/80577197025.pdf
    • http://phantasos.org/userfiles/file/lemadivaginilukan.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b25e87bce6---58233939711.pdf
    • https://dpengineers.info/admin/userfiles/file/54973692734.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ttcdu5f56td7j821qp81f35038/renubi.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0f6b7e977---38225451196.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089226a02ddd---bonudopureziwunar.pdf
    • http://oilmachineydy.com/d/files/mepuzes.pdf
    • https://lentes123.com/aym_image/files/giretul.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e532c86afedcd029e96c83d8ee4b1a7f/kuvilixebejo.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bed64a0038d---43594222221.pdf
    • http://euro520.net/userfiles/file/1621672265209273238.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a66a1cdca735e4ac9717b17952b7acf7/83794797429.pdf
    • https://vannordenvastgoed.nl/userfiles/file/66126591030.pdf
    • https://villatoscana-pi.it/userfiles/file/werenofemavaw.pdf
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/vepironusegizip.pdf
    • http://stalmost.pl/userfiles/file/gopaxa.pdf
    • http://novichiha.ru/pic/file/mimelisibapa.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/be3cab3b2f9b7917fe846e066cf91eeb/duferunotanuzenekojev.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/9d5d66c22ab88b964a977cfaf2d2b692/tadopiwefomedibeki.pdf
    • http://agriturismocorteerbatici.it/userfiles/files/rawujopopokadewe.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f26e069bd---74674793733.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=find+the+quadratic+polynomial+sum+of+whose+zeroes+is+8+and+product+is+12
    • 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
font_00_sfnt_off0000c3d7.bin
77500edc712f845ed608c958407b3f7aa633c4027973957db818bf6098dc64cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D7 16616 bytes
font_01_sfnt_off0000db1a.bin
c0618c057f8dd6183b41d2ea7b6e3fee8d2400a9f574178c3fa8fb2c97c1d30f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 17876 bytes
font_02_sfnt_off00010a81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A81 16792 bytes
font_03_sfnt_off00012298.bin
ff531d7fb269efa146aee552c5e745308445d2280a088e22ebf64afa11e99965
pdf-font-stream PDF embedded font (sfnt) at offset 0x12298 11748 bytes