Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0736f3f2eb2d1c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-01 22:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60d8b191f016b09d5698cb0fbefb6f40 SHA-1: c8985b1b34661cb1ec6889668bd2940ed50e9f87 SHA-256: 3a0736f3f2eb2d1cdc78e145fb72b36239e29a2d9bd18c44278120e86c4f7c95
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://serextion2006.com/js/upload/files/bojosere.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16121787ff3ced---31441086144.pdf
    • http://xn--j1aii.su/userfiles/file/52753446329.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070955e04793---93710466304.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608893cf48867---27196904321.pdf
    • http://accessprecision.com/userfiles/file/5012406711.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4cae57494e---pogamudivab.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/9b838775c6bb1e29e20e128d461228a9/gavodokipafevotawowefo.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0af5bc2066---8333992114.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/vikevegivo.pdf
    • https://www.leasing.net.in/ckfinder/userfiles/files/93651379924.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6353bd4f30---51496182898.pdf
    • http://yngc.ru/admin/ckfinder/userfiles/files/dozapunof.pdf
    • http://ctnphrae.com/ckfinder/userfiles/files/71074327289.pdf
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/eb754bcb906e584e239d0f7981e81f36/53482191155.pdf
    • http://pelesiuvalymas.lt/i/File/vifovogawotixamube.pdf
    • https://casasholidays.com/scgtest/team-explore/uploads/files/nedaze.pdf
    • http://capital96.com/userfiles/file/vukisojaweraxomesuxi.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8fd97621ee---rasobezibefax.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/0b78ab125b382395966db02c9101351c/teneteda.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/q9lhhmsmas68mp7bktn72ao484/tevarigomomeseparifot.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160edd18a5a504---7313224656.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/0e3d5d8dc4bfd6dfe7e8e83b8e8395fc/xonoxu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=college+canteen+song
    • 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_off0000d934.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD934 16792 bytes
font_01_sfnt_off0000f14b.bin
66ccccc98d93a7e061b247fa8167b7e7a43372634ff438a92d748d7a62418809
pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 10244 bytes
font_02_sfnt_off00010888.bin
5e9bbabdc5b91b66740543bc1b2d4cc6c15f999a5cff18bd3e049674765218c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 17564 bytes