Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7aeef0297c2b5d8…

MALICIOUS

PDF

88.4 KB Created: 2021-09-01 03:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e59005e0013db4c8362abcef6c7ec081 SHA-1: 720a9203ab76754af3cac7b6f9802e145a99f124 SHA-256: e7aeef0297c2b5d84f425f9545ddd6aedbf53af24cf3e295e9f0467025e3ea48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://gurukripapublicschool.org/userfiles/file/46961898107.pdf In PDF document text
    • https://dacola.com/upload/files/39964134563.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/bb5agk2mq83vgk0eml9s11o4k4/dinigatilunufaverokedapuv.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/961e66cdce60d720e3f59f79d2268af5/5526049532.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/xurubatiwudu.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/sgq96vhk5l5h17opjsm8m6oib6/rerivokusamudefizopitore.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/64255516302.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/49681334236.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/1c30f7mbdv7e7r9gts38ehq5ol/3680405058.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/gisetogisosavexinodiruwe.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086c52789db9---nitatetefepegafatijetitox.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/69758563949.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/334732b3217bf2c5a2cda0f2617e4683/93576296707.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/doxajasexanesivomuwa.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/4c445185853b4b1c58f6f9a0f89de420/38810013617.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/97086825228.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/63979844981.pdfIn PDF document text
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/pomitosemexo.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/jitixoxut.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160786472ae717---sexosekikapovotud.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/jipakunakizewurixonofig.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///luwemolanamu.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/relopetemidosafewupakix.pdfIn PDF document text
    • https://tdfstore.it/file/gevagisewizufa.pdfIn PDF document text
    • http://xn----7sbabjkhbzbqti4a3apfmdd2s4b.xn--p1ai/ckfinder/userfiles/files/mimuvazuselasarisujak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=find+hypotenuse+with+angle+and+sidePDF 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_off0000ea92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA92 21264 bytes
SHA-256: d09ea0973d8c1082334abeb13aa9081a9317a9a90d79463623e195513b37a979
font_01_sfnt_off0001230a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230A 10848 bytes
SHA-256: af1d2487a607359ebf47c404238ebe61f8d5521cf7dad8b1a1e161abf031189c
font_02_sfnt_off00013bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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