Malicious PDF — malware analysis report

Static analysis result for SHA-256 88206cdc81bf819b…

MALICIOUS

PDF

75.8 KB Created: 2021-07-05 07:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb2432363c27d22fae72de627633ac19 SHA-1: 0fe9ca91413509b71c80e1c50d2638c86a3445e4 SHA-256: 88206cdc81bf819b3024e2d6263d4a938f98bd9861017e9bb2bc9746625543dd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised WordPress sites and disposable hosting. The presence of numerous external URIs suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://infrive.ru/uplcv?utm_term=best+picture+2020
    • http://liavanhaeringen.nl/userfiles/files/28159946010.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ki0u539gc7mg2okv9mr34f6mv7/dorufukatinam.pdf
    • http://hcviet.com/img-phuctri/files/xonagabamalowud.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609277c56693a---kodadowuzekarufozob.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/79a7d069a2aed664e34b0912fdc5e527/tasupidowabudeb.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d2ca4960b---21350785580.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5070688d8b---gomobawevidod.pdf
    • http://altinay-law.com/images/file/xidit.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/eeb26081774baa62b8252897abe2acfb/sabit.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a07587627c---raxofewudokogerategepamon.pdf
    • http://faradbox.pl/files/file/82349274978.pdf
    • http://alphasigmaoverseas.com/userfiles/file/kifega.pdf
    • https://psfund.org/public/uploads/files/cms_files/62417950757.pdf
    • https://publicbridge.pl/userfiles/file/womuw.pdf
    • https://airshow-bg.com/file/32389604247.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e21e19ec4---31609007063.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089efa9a64cf---34782798357.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/0696b6346fc2d8ca7c0a46581334c783/42201129101.pdf
    • http://upbfassadenbau.com/upload/file/noxexojewoxezutuxu.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076b05bb5ff1---depomusosepe.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160719eeb266c9---fokirek.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/b2b941e81ee94019ac4ed2acbd129e56/naxixixavipimubigebagelep.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf37ba3612b---42003605565.pdf
    • 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_off0000c61f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC61F 16792 bytes
font_01_sfnt_off0000de31.bin
9e30b4bf887d0816df4c152101fdc567df135c40cd10c74098a4dbaf6f6e12ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE31 16516 bytes
font_02_sfnt_off00010943.bin
142fec7267d48a201ec176cd6820451cd4bcf5fe7b2d3675f7873071edc55c63
pdf-font-stream PDF embedded font (sfnt) at offset 0x10943 10328 bytes