Malicious PDF — malware analysis report

Static analysis result for SHA-256 1090a8b7eebc2177…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 00:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 71c96ebfc460155a63b5e4a25a55fec9 SHA-1: 6bd59ea85203fe151a1d93dde7b83f6e617d6271 SHA-256: 1090a8b7eebc21777bc2242045727f98a4cdd43f3e7ab143dd8b3f5a06f01a1b
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. The 'SE_CLICKFIX' heuristic indicates a social engineering attack that instructs the user to execute a command, likely to download and run a second-stage payload. Numerous URLs were extracted, many pointing to compromised WordPress sites, suggesting a link farm used for hosting or redirecting to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://krisoc.ru/uplcv?utm_term=crop+pdf+file+acrobat PDF link annotation
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c372fcb1bd---dizinosixonifofe.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/27889884767.pdfIn PDF document text
    • https://egf.tw/test2/images/file/18689603873.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104e8fdaca90---jafeji.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/7418621503.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/repulodosabuworofa.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1503930ce---palexekexakepazipebej.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/naresikeg.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160722010c3af5---79431128307.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/bfb2efd30f0bf2e9d7bc8610944e3eb6/birafuwabivanopisof.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/pexaku.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/joxosolikozuj.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/99186832682.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/pezatuwututaka.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/73162157569.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/21478fug9dd746rjvlor46m8e1/rofafopovupikuxima.pdfIn PDF document text
    • http://gekon.net/userfiles/file/13323148606.pdfIn PDF document text
    • http://deforma.it/userfiles/files/leviretixovib.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160900985ea0d2---lebolilupokebuz.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/lahr823qh8rhpj7ighcftmkbdm/11244205378.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82371100440.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160daa6bb85d11---79960003897.pdfIn PDF document text
    • https://tdsns.ru/userfiles/file/11513115781.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/83619215367.pdfIn PDF document text
    • 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_off0000d833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 18208 bytes
SHA-256: eee9d26d8eff4f500210033a5f257d391995beb9bf69dfe6b019d3b4f9fa9569
font_01_sfnt_off000106ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F05 10512 bytes
SHA-256: 23d6ee74355f97ba8100b5fccdb36cfcdb0574c0838955f2e2474d9dbd10b04c

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