Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e31c383d361394…

MALICIOUS

PDF

90.5 KB Created: 2021-08-10 02:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 573b18bd8d1e042af2f00170f768f55e SHA-1: 10f6c9c6f426336ade4b4d6060546d720f74f66e SHA-256: 73e31c383d3613944991279f2d29daf0a2448e8a053ad10523ef24057fa857a7
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. It contains numerous links to disposable hosting sites and compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The 'SE_CLICKFIX' heuristic indicates the document likely instructs the user to execute a command, a common social engineering tactic to bypass security measures and download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

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 http://skipjackpoke.com/ckfinder/userfiles/files/16027059532.pdf In PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/7e6a7909c16f564f161241598c5a9b80/2407664442.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/fcd56f458062bf2ef841a1f35c6b38c2/tavixepegobizol.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/144f4a8790ee856cf919ef37af65cf6a/lanufavijosutelepaguravox.pdfIn PDF document text
    • http://iwort.de/userfiles/file/71090402144.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/eab0cb6b03e913e379efaf65c7a02647/93113820922.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/26000208429.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/7ad16ao0745ifqf0c80es2kl1s/4337568287.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e11f91289---36237684181.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9d9c2f3df---kurizakejoxidixugubepela.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/wepupagupefobosedej.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/duwax.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/29914342831.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/9ibghutvv2jn315cl6nbac7vc2/81111152808.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/a60da2f4fe1f527cd3d61d62b40bf23a/wojumamejofogalato.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/l1erj8v7og3hanmpdam0tp1d5k/fowobapabipurirov.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/fuluzorenud.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210701152730.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/vusitutepurupukuzilofuk.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/14912618775.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/e25b9a2130bda44d264bab8a8a2326ec/xoxupuboxivenimukarazuse.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085073c482aa---tatotikipi.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/6350354570.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b617c162197---pomezutetotuvaz.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a198515e8cd---23214651772.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/6be3b16f8ce9641e6fdfd2378b51609e/magugebanexifovujulogomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=why+is+my+excel+running+so+slowlyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 1728 bytes
SHA-256: 164b17f13be751c428b8a7847bfef4401e4c17c2bf41cfc2fceec83f5d69c6ba
font_01_sfnt_off0000fc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC08 17300 bytes
SHA-256: a3883b3ac7e0d9fc08f97fe0c2116b6c14dec4c04d8c8c86c38403b350faebd6
font_02_sfnt_off00012929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12929 10812 bytes
SHA-256: 91603dbf058498b88d2f845820965f66b271a36feb99a2a324894a8d09761847
font_03_sfnt_off000141f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1