Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3a869d70a4d809…

MALICIOUS

PDF

82.7 KB Created: 2021-07-09 23:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86ad3ed6ed6034799ca16ed7ae06c7a5 SHA-1: 509cd5a3a3aa9769ce55cfc96d56201d9bd7715c SHA-256: 7a3a869d70a4d8099770cb8d0d6de57c526f42f3b93a7bee25005802a71776e7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The primary attack pattern involves luring users through a malicious attachment to click on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://garglob.ru/uplcv?utm_term=no+inspection+contingency
    • http://creativetechno.in/userfiles/file/32537875415.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/mlk8ojre2befaoes29ajv5ne71/vewogobofa.pdf
    • http://www.findvoters.com/userfiles/file/bubuxivibiniwufemowas.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098e540edf13---4568695710.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b93bfc2507e---vajidaweravo.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f2771dc18---xenumirobidikatezam.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/4c31e0e8a7c88fdfd93c3cc092a33dcb/litedobeza.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce7488290f---firirorarewudif.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6228a65f75---nuzejatejorulimul.pdf
    • http://incomsistema.ru/ckfinder/userfiles/files/73897119270.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/b834f89dedef9afac77093d2f54d5ad9/27383779559.pdf
    • http://owv-sad.de/userfiles/files/zevulepekajumovisab.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85f4ec47ff---pesubivasevetukirijewire.pdf
    • http://analogsys.com/uploaded/file/1230698526608ae7f4d1f8d.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c17de268ccc---pizowofiwaludezojetegured.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/71842806611.pdf
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/bexenus.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989779bfe94---sakidatizavumez.pdf
    • http://asja-doll.ru/userfiles/file/panikisanewa.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f07ae724e8df65afd9990f42721d6018/tivat.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_off0000e2be.bin
9ed7f184fd93e074d4809eeef61d951606c4d997798b490bc39dcefdef33e5d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BE 16724 bytes
font_01_sfnt_off00010e77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 16792 bytes
font_02_sfnt_off0001268e.bin
a849f96fb4d3a5fdfac40314dc49a715b75295c259e9f51548174b8245fa5f42
pdf-font-stream PDF embedded font (sfnt) at offset 0x1268E 10332 bytes