Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e3a0eeead80a59…

MALICIOUS

PDF

88.7 KB Created: 2021-06-27 06:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8b4650d43be6b4077d59a5327d38ee0 SHA-1: e516ba8a2db10d40aecffb70bf10e58a58f7f305 SHA-256: 55e3a0eeead80a59ce4ead104ff76b32d0d33385ac309bee50c4b55821d83f04
164 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=pulled+muscle+in+lower+leg
    • https://himalayanthailand.com/image/upload/File/27383760170.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/540501f02c154140b66a6d2b5bc7c00b/71896915719.pdf
    • https://peterdegendt.be/file/26498305263.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/17402630619.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad89061e573---51409156668.pdf
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607048eaae79a---genujijepaxe.pdf
    • http://jrmhandling.nl/upload/file/31703969103.pdf
    • http://ampletrekking.com/userfiles/file/91108284638.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210616163155.pdf
    • http://hayatteknoloji.com/webimage/file/famat.pdf
    • http://hopkim.vn/upload/files/97914990920.pdf
    • http://domainecomps.com/documents/files/45262277295.pdf
    • http://beulahcooleycollection.com/clients/870349/File/tilikizulazaserasejup.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/f80431b13b8fde2f1457bbf13634ac43/93285254085.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6adde430b7---78364185951.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160813ffc626d5---gexurude.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef77c33d09---kexupovit.pdf
    • http://shosholoza.de/file/1106972167.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608d79a78954e---24682606264.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/6a7100857bb649890e31063595e7ccc6/tizinoketul.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160971f9b0cd47---44600219357.pdf
    • http://pro.ovh.net/~tribuene/images/banque/file/14070131654.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_off0000f755.bin
4510dc3f169704aa8f4a5c4b73d3d867730e81e80c5019451cf05d7966070572
pdf-font-stream PDF embedded font (sfnt) at offset 0xF755 17108 bytes
font_01_sfnt_off000123dd.bin
28ceacc56b0e3f5ed850e4fd1eb9abe06fe215a2f2829a39479db4ee3ba91108
pdf-font-stream PDF embedded font (sfnt) at offset 0x123DD 10640 bytes
font_02_sfnt_off00013c04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C04 16792 bytes