Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac792de1c4f941b…

MALICIOUS

PDF

84.6 KB Created: 2021-07-19 08:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ac9796bcf84c36c1dfee4399c131076b SHA-1: 21e200b403498934fd1a9fa069c7192b7a4ecc53 SHA-256: 0ac792de1c4f941b7623535f3db5c7e0e6d5b762714cb4920aad3270afcad05e
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. ClamAV detected this file as a phishing trojan, and ML classifiers also flagged it as malicious. The primary attack pattern appears to be directing users to malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://contabil-fiscal.ro/mm/file/lelapofosukusax.pdf In PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/qtv75nkaba9up0ckjpvqjmmtk8/sotezewevomubumovu.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96318eb159---98968143655.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97b8e209ce---lofusenimivigowixojuderax.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/nuguvexukitasozepolore.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/730674fbfd67a003ccec99474a91b989/tamowojowofimaguxezo.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a47a3998eb---98758917895.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607df2636760e---88027782177.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/93908053865.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/99166341960.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/64578664571.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/45656443623.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609410f2f29e0---wagitakapoxi.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/rexikidipapevapunejuropos.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/9532228669.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/66149013815.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/832036168dc58b6f6269d20c0c9ce998/jikag.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/81251628301.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/128a900343aa28c1fc3609ac61e0219a/petukitenabujekavifiseg.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c53c976ff05---5598950575.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780be414833---89417623471.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/017818b5af2e77163c34579e1d74ca7e/76288169838.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080f24a8b099---likaxabakamalujevo.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085232966f1c---2602523775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=declaration+and+initializationPDF 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_off0000e6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B7 17876 bytes
SHA-256: 30c6ff80b9ba8e187d8bce61f7d05521c87e4fbbbcd1a1a37a1543cff754bf3b
font_01_sfnt_off000115d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF0 10256 bytes
SHA-256: 3b4599c87958c00f9c05c0ea44506c13ad4fbbe5a5bc7e1b43c49df3aeedbb4a