Malicious PDF — malware analysis report

Static analysis result for SHA-256 351db83d7d8cd3c6…

MALICIOUS

PDF

89.3 KB Created: 2021-07-06 11:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cbaf226193e9d86fa5e2e8fa5938e93a SHA-1: 7bca2c79a430b4ce47bed0e71fb97f8c6a86029c SHA-256: 351db83d7d8cd3c6d4bb7323faebaaaf5f3d0989a376a14eba7074d7ce131129
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous embedded URLs were found, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'utm_term' parameter in one URL further supports a lure-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=lucy+full+movie+watch+online+for+free PDF link annotation
    • https://amursvoidom.ru/media/files/94551753994.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7386108538.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/79340618912.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/f5d2c3386a4acb04134bf3bd65be4122/16631256060.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/jokolegali.pdfIn PDF document text
    • https://ebooksweb.net/files/file/25656610343.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/zanamusov.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/fevuja.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aa120beb84b---zoxoguveduzusanasuweg.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ea86ca9af---bezegizexinijixivuradet.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/m5bosvsq0784h4gn9l7s7m35n3/lugopolefepexutaxo.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/jenupowakojuxuwe.pdfIn PDF document text
    • http://skyparadisecoffin.com/images/media/files/gonexazefelovu.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096f88d4e669---42112608838.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7b5e1d21b---niwosigugek.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/f7722676bb609fe2138835338e769366/subanaxikonesujadip.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/76835741086.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdb46302ff---12859177640.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/dumonorizinixabolukibi.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/pelixamamutike.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/98057321362.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b425de5c6d7a61ed52d17b703afd2d2/39810062357.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743978ce012---54116297631.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/e305cfbd12466f5b88766ac163e28a71/dalagijij.pdfIn PDF document text
    • 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_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 16932 bytes
SHA-256: 9317007d950ec30adea1bf5f84ae3dc65a8cbc09a0eb3667128a05c5c4926338
font_01_sfnt_off0001256b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D82 10756 bytes
SHA-256: 545d7dd67b71ba9b6ab9d351586d87be5dff1d9b14ee88e3aec725436f0d2b4a

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