Malicious PDF — malware analysis report

Static analysis result for SHA-256 390111bc20c2dc1c…

MALICIOUS

PDF

93.3 KB Created: 2021-07-01 11:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3039bd6a8a3235f5fa21c09b5a74632 SHA-1: 112915bf795dc001bc10efd87a0221de6e73fbf3 SHA-256: 390111bc20c2dc1ca77ba48286b92b4c26eb8d12f7c0681b3d81bd572f2404f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=thanks+for+reaching+out
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c218f0d9a2e---soniva.pdf
    • https://sunrise-photon.com/upfiles/editor/files/zexopogo.pdf
    • https://olterus.org/contents//files/47637879240.pdf
    • http://studio-castiglioni.com/userfiles/files/27407974285.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e5e8b6a03c023a69ceab7093ae8311fb/91300884981.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608828484d873---kekusurazejefusunal.pdf
    • https://fullgame.hu/uploads/files/22035467037.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081db8213b5a---xafunofadabizo.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ab2784d1---mapemewokozutes.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c953f077d7f---bugoruwavitibakidafarat.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/r2sapcohvdrjg87gkao39rv7os/85423156838.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d3c4303a4---53553776974.pdf
    • http://www.monts.sk/upload_images/file/89860949383.pdf
    • http://amon-syotengai.com/userfiles/file/59424638575.pdf
    • http://asupuro.com/user_data/image//file/pewodujotajidobofutubiro.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/8e5c081b43fb49ad51ae0c7c008e2fca/xupezikimorol.pdf
    • https://alakharia.com/public_html/userfiles/file/48082201561.pdf
    • http://pulsarvn.com/media/ftp/file/xizuwatibalavagu.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/7os8ilv0nqjvi6pvtborsqh1i1/77262372726.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/0d393bb191e33489134ba916e404df65/19510467190.pdf
    • http://baugeraeteverleih.de/benutzerdateien/28979021843.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff00836687---57386519320.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160860023886f1---23795877865.pdf
    • http://dinskayarealty.ru/media/file/72685081503.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_off0000fb2f.bin
d7b9e4969e536a50d168b6f76b840d7588180de3d6002ca8f11a2cadf096872c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 23004 bytes
font_01_sfnt_off00013545.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13545 16792 bytes
font_02_sfnt_off00014d5c.bin
cd2d8e80e93dbf835df83b2d90fb0a22df90fdc7748b9d894b0e1956c9dbea79
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D5C 10724 bytes