Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ea314d605c1da4…

MALICIOUS

PDF

100.1 KB Created: 2021-07-07 19:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ded391f110e66fc870bca7980484938 SHA-1: 09e8dd3cbdf113b0cdf8c77a5f6113d4ac17549b SHA-256: b6ea314d605c1da4e30323915444ef49816cb6e5c3ea0675b68d13e2b1013e33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to lure users into downloading further malware or engaging in phishing activities. The presence of external URIs and link farm heuristics strongly suggests a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://coretry.ru/uplcv?utm_term=things+to+do+in+banff+national+park
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160905f4f52b53---zabalimodojan.pdf
    • http://cobbpaynefamilyreunion.com/clients/862770/File/31219532049.pdf
    • http://originalcheck.it/public/img_admin/file///44227551083.pdf
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/4d3ulco2gg7rc7o7f8lavvvu81/52371831061.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ff5537521---20638354982.pdf
    • http://acudrved.com/ckfinder/userfiles/files/kopodowelolonezizijere.pdf
    • http://wijnhuis-vaessen.nl/site/data/ws/files/rujudasexiwameviwibo.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609846f670ee8---83507041287.pdf
    • https://davaocarrental.com/images/file/dodesowabipa.pdf
    • http://ehoron21.mn/uploads/files/gurizofubavobuwabiso.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a325589269d---80689651035.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/769233a60c67237419c0a229b2b8679b/melikisefa.pdf
    • http://sosnovgeo.ru/userfiles/file/jekavevizixogeponagipos.pdf
    • http://hy-concrete.ru/d/files/10017071644.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16074fc42e042e---xenupifapedowap.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/e68c511ff32c19ab458006a667058ae1/19958191667.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/vsqhk45c8neftak51f1869stqk/tikajebakowuzevilebon.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073484990ff2---39518726457.pdf
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/51953557619.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a864ed5562a---80816746189.pdf
    • https://nyirfa.hu/uploads/files/37103387517.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608da0399549d---lavimugepavamukow.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16074169bd8d0e---wigewerizimekamelodi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122dc.bin
c64389ee19a42572ee165e4a653e5eceebb0c35a76716bad71b7879e8c877364
pdf-font-stream PDF embedded font (sfnt) at offset 0x122DC 10840 bytes
font_01_sfnt_off00013b51.bin
fb1c514cda642d14cf9fc8f9d8011def7b2614bd1d4cdbc844d6c68ccad8fe63
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B51 17496 bytes
font_02_sfnt_off00016927.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16927 16792 bytes