Malicious PDF — malware analysis report

Static analysis result for SHA-256 819475715cdc435a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 04:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e4e3e23d431133d886eace7c03fabef SHA-1: 80315a7bd90fb7017a4ca036ef9ab4c3490171fc SHA-256: 819475715cdc435a81ac9f60d66cc3d6370bfc8ab3aa0f0a3965733d384b521a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malware or phish users. The presence of 'utm_term' parameters in some URLs indicates a focus on driving traffic for specific downloads, such as 'governor of poker 2 apk download'. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=governor+of+poker+2+apk+download
    • https://kaskad-74.ru/images/uploads/26378353327.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/9922128318.pdf
    • http://chiesamadremarsala.eu/userfiles/files/34796499921.pdf
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/41449841154.pdf
    • http://www.mousumibanerjee.com/fckimages/file/jatiro.pdf
    • https://sergiomauri.com/images/file/83419738153.pdf
    • http://bptramptour.pl/files/file/42878933529.pdf
    • http://huntland.hu/upload/file/ninodajefor.pdf
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/96119142048.pdf
    • http://www.morrisjones.co.uk/EditorImages/file/8210697290.pdf
    • http://balogmihaly.hu/UserFiles/file/wukazuvanenidanugop.pdf
    • https://atlaskvartir.ua/data/uploads/files/26170913360.pdf
    • https://stratasphere.online/userfiles/file/94233646574.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412fa93112c---xulusiwumazaw.pdf
    • https://awinresource.com/uploadfile/file/xinosafaga.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134ff3415b7b---rutekij.pdf
    • http://zge-led.com/luodan/images/userfiles/file/figufedewirev.pdf
    • http://sieuthikhoacaocap.vn/upload/files/ridamatubazevowuvosa.pdf
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/benupotapip.pdf
    • https://cabsfromheathrow.com/userfiles/file/33597516159.pdf
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/10134949026.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0961c7141---nukuwutewoxuvu.pdf
    • https://susta.vn/userfiles/file/jilek.pdf
    • http://www.celso.org/download/1949524237.pdf
    • https://fluffy-chins.com/images/file/61481553035.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_off0000d3e0.bin
ea894039a23ae110854e11777c7d08f140e1a1e8bc4d9c59368bf50382118536
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E0 18724 bytes
font_01_sfnt_off000104fd.bin
c5335c6c04ec16aded7e2dc03293f7e796cfab85efb69ed6c8125efee4c6de04
pdf-font-stream PDF embedded font (sfnt) at offset 0x104FD 10536 bytes
font_02_sfnt_off00011d3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3E 16792 bytes