Malicious PDF — malware analysis report

Static analysis result for SHA-256 a664c7597d92af37…

MALICIOUS

PDF

83.8 KB Created: 2021-07-17 11:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 93fd4102def809eec9c5f5ececd01a6a SHA-1: 9a1d7fe29fd313c047e7f517eb3078b6d373fcd0 SHA-256: a664c7597d92af37a8cb4920da76c0af91813517553f316ec00d7f31aea7a24f
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites and other potentially disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm heuristic strongly supports a phishing or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.nagsa.es/ckfinder/userfiles/files/54473545116.pdf In PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/8871849382.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087841059088---67340652098.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/6960d918236a4691d04a932907473ec6/19589671517.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/rosugunapakopabanar.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b80b11fbef---gaxetonabirineziterit.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa738752b---82430686582.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/7417981192.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/9c7gu2cqn2nh172qkrsps5ohs4/jobopekesebanutavameleg.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/veniforifisizexofisago.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/r4o7ivp6nnucc0m1v9q0007oe0/56131350368.pdfIn PDF document text
    • https://marosme.ro/hirek/file/54190583908.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/pupawe.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/lekozexebimuxelefuxiweja.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36ec628948---fiweritip.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fc955f764---rifovobajaxuvexafux.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160733a1d6b6f2---fefikavekazo.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785fd7e323a---rafuwi.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/fufunevoge.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/31200928288.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae43bd5b0d6---52143451666.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/91914698184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+should+i+do+get+pregnant+fastPDF 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_off0000e4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E3 16876 bytes
SHA-256: be553646e0ce3df92d0d85534636d5d3bf3d740b1328100068ba31e962f5f803
font_01_sfnt_off00011106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001291d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291D 10872 bytes
SHA-256: f671f9f59fd3c3d5a53727826a2ea34207aafcf4bded9f64252fa54a101add77

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