Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db60a1cfd0b10c8…

MALICIOUS

PDF

86.8 KB Created: 2021-07-15 09:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fa6678ff47d38a692d847cfac170287 SHA-1: 3852511daf41c65cbf726ca25a8d9d10f982da2e SHA-256: 9db60a1cfd0b10c8b2431edaf08c0545299f21c10d8c8e20bae45a0d6bfe0f7f
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a large number of links, many of which point to compromised WordPress upload storage, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of multiple external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dd4831903---35126723025.pdf
    • http://accessprecision.com/userfiles/file/67124645499.pdf
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/85611003011.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/r1t0utff5qmhu0v33ej65stm44/gewojisezatesa.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160baeb4dadbbf---sekevaxesetosenexetoxefi.pdf
    • https://shoreluxurylimos.com/userfiles/files/11035193115.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/rgp6a8dd73a6hhbi1q728j11c4/zatonujulemegog.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ad553a2c617---kuxuxemu.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb7e91216---fokez.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/559ac121c6b7a1d903f14c62d9dd47a0/pirowunadexajowoxi.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/b0me9432metlriv5f2qjq26un5/garexojozuvoje.pdf
    • http://4998horo.gmmwireless.com/contents/files/xizudad.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/87489032577.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df238709a1---94560458119.pdf
    • http://sitoad.com/bbqjoekey/files/202106100158488264.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160df1c21e1ecd---viwefemeditupab.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607603cd80a33---denutukivanopanefadoxune.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/8319523bf2ad9af0113aaf4ed8421122/11888790844.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/9ba38a4255fe0be5695bc5b7b6af0702/tigapisojugu.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebc3c8d787---11583388003.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b8a3bf382---bexivonipowuwonidojetoz.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/62332b335d50fc4109a6d7daee4cdf23/wobodebejuvegijulejed.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/18082166254.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c224dee0cc---zeruxeb.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5aa37ae9b3---75583852895.pdf
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/lseik6c8khqoa2leee87joth9c/deruzowudofojaxuku.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=can+all+glass+go+in+the+oven
    • 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_off0000f32f.bin
e6568bf230aa90484f944d3e0c03b659b5b067a06c0c0c09f2f85441ab75e720
pdf-font-stream PDF embedded font (sfnt) at offset 0xF32F 16524 bytes
font_01_sfnt_off00011e2a.bin
a8c19353ad41afa13574a3ad09d4c5c2d7998e4ae9970e561602fa7e009b95e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2A 10384 bytes
font_02_sfnt_off000135ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135AB 16792 bytes