Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7f2653c45d0a27…

MALICIOUS

PDF

82.7 KB Created: 2021-06-30 16:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9ffe96f30f17cb9217146cf3fb907c1 SHA-1: 9252906bbca3b3f32144fc5c2e09907e8085bd58 SHA-256: 3d7f2653c45d0a2757d63f6e6fad5a069bbcb086a5339e70a6da3643650742cc
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites hosting PDF files. These PDFs are likely designed to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160775100ca3a3---gotivigo.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/145572fc4ccd592dc3159cec260082a9/68694283272.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160800341df5e1---90730206572.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0251519e9a---49004552067.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607400f9b57f9---5277599837.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfd4c64e4e---kotuxitimewojavivokoxax.pdf
    • http://www.lebedosapartotel.com/data/yukle/files/23262128718.pdf
    • http://dui-antidote.com/images/userfiles/file/72148612364.pdf
    • https://marosme.ro/hirek/file/xoxujifajavokexav.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607756e8619b1---55982628934.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160940d852e9af---kijufujufunogoxopitof.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16097e2dc5e94d---puxoxemuro.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607202987d00c---pevolubevajevaxa.pdf
    • https://hanahana.vn/media/ftp/file/mujikotofowotopolepevoriv.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/b381d12be6003d1975e2883aa5a6b112/jifisuzijupusabenaduduf.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078715e00fde---mevugejidubetavelumodor.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/cb07ed73ebfe453f4d6a3e7306dcc492/tasizunivil.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/37189e2fbbc039553ba1fd962fb95442/5286441425.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/e7343e5e7a89395d35ae8fbd50454b58/watadij.pdf
    • https://seitonsolutions.com/ci/files/20092217665.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b77d0effe---15457829906.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afe92d7f315---25779975479.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/deb8004e943fa825dacdd25e23d6ce08/gapegatavu.pdf
    • https://davaocarrental.com/images/file/87758329234.pdf
    • https://residenciasanamaro.es/userfiles/files/89447083278.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=draw+this+in+your+style
    • 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_off0000e2c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C3 16792 bytes
font_01_sfnt_off0000fada.bin
7b3b415c80dc0dc3a4b04d2fe591f08c1800b020526936d30ed05d282ebf30cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 10508 bytes
font_02_sfnt_off000112c5.bin
9059305c529f083c4c9df54e1b8c29cc79826dbab55ab6db03566cd0bd8dfff4
pdf-font-stream PDF embedded font (sfnt) at offset 0x112C5 16528 bytes