Malicious PDF — malware analysis report

Static analysis result for SHA-256 a69fd040643ac98f…

MALICIOUS

PDF

85.2 KB Created: 2021-06-30 11:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39e4f132f3b020636b6c61a4ecd60ae0 SHA-1: 877a05bc8f125da0918f3dee47bdfa1a030454f2 SHA-256: a69fd040643ac98fdd5813dd23c8df642215b2035ee07b778e6957c9d7d40cdb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, utilizing compromised CMS uploads and disposable hosting to redirect users. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b8sft52499jr3v22jgcjr5ndo2/dedagaludopa.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d31dd25d2---90368263732.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/cc62bd5f332be5e258c17e2914d359ef/vakamirebef.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160867a500711f---xumanuxo.pdf
    • http://www.ujepites.hu/userfiles/files/56260092615.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a5a4d5189a5c94cfa1d5870faf4fff08/nadime.pdf
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/fvlep9lojsp9h47buh38ujnbcv/rozan.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d2d7010c697546f707d73bd0b8e5b984/22833526874.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079c6b070349---39696600317.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff95b4ce94---lozememoribifobevapo.pdf
    • https://ryokanclub.com/FileData/ckfinder/files/20210618_07A367AA474C6F5B.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1720ae383---sabazikifavuvamuxilap.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f2c5c7e808616cdb489ca43aa4ae621f/62759185677.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607906005cada---5338870721.pdf
    • https://advance-pack.com/editor_upload/file/14648940089.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/0d6702dd4bc9d8cdd166cc61dc8de58e/bovufekilagesawuvado.pdf
    • http://alemotta.com/resources/original/file/guwupenivajapowi.pdf
    • http://karate-talence.com/newsite/userfiles/files/pasopuxa.pdf
    • http://cbwmd.com/uploads/Files/kabol.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/002bbecfe3e8ec93aadd3f03edc02e1e/17157994669.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/37hvqnc33uc863oq38g1l2p6lq/79214163388.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=organic+chemistry+notes+jee
    • 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_off0000e59b.bin
cc7f3659862ca56f96ab563c28bbeb7b982e427e24866e7c9ceb43dcf5c79e7c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE59B 10900 bytes
font_01_sfnt_off0000feb1.bin
6d97bec4acf7e1fbe8e517d00663ce4696689d5ed6f9e22a7d6445ad1a3298d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB1 17980 bytes
font_02_sfnt_off00012df4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF4 16792 bytes