Malicious PDF — malware analysis report

Static analysis result for SHA-256 609b5da928c4ce2c…

MALICIOUS

PDF

85.9 KB Created: 2021-09-07 17:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b2169210414ec6e27373bec5d07aaf1 SHA-1: d0fa43f416891e9b53b15cba3fa75dc9b2814bf1 SHA-256: 609b5da928c4ce2c44b77a86e9e7119d644399f5f798aef92c1cdad1c07cfa64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to numerous URLs, several of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The document body is unreadable, but the heuristic firings point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://artospace.com/pics/file/80315067984.pdf
    • https://sunkamalzemecilik.com/userfiles/file/bidenebefiteramofireso.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/93ec5830a36828099b4cdcecca693350/gebus.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/0d70l83u93h9emhh2d8vforian/xotumukeritufulofixu.pdf
    • http://master-br.ru/img/file/19166409538.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d09caec2a6---fanekexelaralekaseveze.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945068a82c3---giwoderovovejumivu.pdf
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/vejidubifejisaza.pdf
    • https://rainbowfurnitures.com/files/files/rerisedilolanorowodajodaj.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083b6ffd3ac3---lexal.pdf
    • http://northmarking.com/userfiles/files/xumolimodufetimufaxu.pdf
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f273321e6---walulomokomefotuto.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/881ubhlhri820i3hub65657q91/kapuvetijeniravawem.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096ae4ecfdcf---73115716912.pdf
    • http://sobinco.cz/ckfinder/userfiles/files/94463877425.pdf
    • http://rklatex.com/userfiles/file/40149767789.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/1c7b7abd5db955bed816c63f3da347ab/fokaji.pdf
    • http://xinyaoqiye.com/upload_fck/file/2021-8-6/20210806010109722463.pdf
    • http://bjhtdszdh.com/v15/Upload/file/20218301918122652.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/296cca67cb1cbb6f36a02eb830e0ea94/84397320988.pdf
    • http://vom-ragnaroek.de/uploads/file/pikeduwuz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=descent+into+avernus+pdf+purchase
    • 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_off0000e863.bin
e8d995d54d0fb83164ee0c8be889b01aa260c687483f2fec739a59a1c43a81e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 18296 bytes
font_01_sfnt_off000117d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117D1 16792 bytes
font_02_sfnt_off00012fe8.bin
c108b83244df3e92aa31e257e0e3f6fa730f8bfeafb65d298483256d04a59cbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE8 10840 bytes