Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2eb1d406733dbe7…

MALICIOUS

PDF

78.3 KB Created: 2021-09-04 03:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cda7b8ddcbee645a668875a93d088854 SHA-1: f0a59104f69e1bb86bc3ca2b16cf06baf3c64384 SHA-256: b2eb1d406733dbe745110f02169393555ad53efdabc8cd9dad798fc54ffd1151
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains numerous links to external sites, many of which are hosted on compromised WordPress installations and appear to be part of a link farm. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs the user to install or connect with a remote-support tool, a common tactic for phishing or social engineering attacks. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612779244454c---posalaril.pdf In PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088f11d97959---nanureruxu.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/26467183579.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/2181decc2c58680eda173521a2005705/44451332125.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/3fb47ce049cf5d0d4bef6c47733ddb37/vadasibefivegufoma.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/jaxabimimamef.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160c75d8c21b0e---125683860.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/fb2b3b01b4efee7c8083e5a2d724bf72/42206429581.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/kfvgtlrq3dcn33hj1vecenb6jv/97906192509.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///66706365191.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/daarprr9l2cj8vr1offft6an61/85199830818.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/rofovunosatejumuwajixu.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/vogixowirisaxefizediv.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/7704374501.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3878e5ad8---98374952408.pdfIn PDF document text
    • https://hgb.se/filer/file/59228239752.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c8e07a65---22114927626.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t3m5csupjdos2drisblp896nn0/62551576537.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/mikimenami.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/satomaguvaneralaletozuli.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/n5ule9u1v8kmp8jm3hb672h2is/45822603127.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/32734450353.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/570752599.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/fokivanogaxe.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e60a2b2d87---kasojukazos.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/42837271084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=download+pdf+viewer+for+laptopPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDD 18528 bytes
SHA-256: a77840fd5714a54099a8bb3326d5b6522feac4e0e3f0ceee598cd66beec78d6e
font_01_sfnt_off0000fba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA9 10476 bytes
SHA-256: bd73f2e77cdaa1fe90d427c0a259dc614dca07d9838ff5acd7f0ec2ce248315f
font_02_sfnt_off00011398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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