Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ff4495e852f42e…

MALICIOUS

PDF

78.7 KB Created: 2021-09-21 01:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5271d33f907679002df3a99be7574bd6 SHA-1: 95bc7787eb005a7efa79e07dd9fc92e40657c4c8 SHA-256: 70ff4495e852f42e0a9cd7343c7799c34d9853f8411417d70ce9f1ad117c2955
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution lure. The presence of multiple external URIs and compromised CMS upload links reinforces the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=3d+live+wallpaper+for+android+mobile PDF link annotation
    • http://alacartedesign.de/userfiles/file/81410703854.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/41704807582.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/wogumowepawuxapi.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tevuwisi.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146100095c7f---46764636276.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/xixemebukoxu.pdfIn PDF document text
    • https://ksboutlet.com/file/files/11739493076.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/desifovojavufok.pdfIn PDF document text
    • http://zuche0551.com/upload/file/sugekixo.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/60589914697.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134cd294b84a---pizulelok.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/63160346617.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/mefizaxebunev.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tubigotokepotidave.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/21048846055.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/66487920571.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/zetilikejijafemiluto.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/86752920646.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/fisaxigitizanojurana.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/9646017520.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141688eedc6f---juxosepeza.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d13757fe0---likojokifosokogapiliko.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a8a40cc35154e84950d4a67217050a85/tatodetujoge.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_off0000d0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C6 10760 bytes
SHA-256: 2acdda1f31db11a57ddedbc749a85530722b52e8da8a2cd378e7f2c15b6e367c
font_02_sfnt_off0001013c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 17216 bytes
SHA-256: 9c33816872c3619d6fa934d65f38222b4aaa9f41428548d591af5a733156d7e9

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