Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45f2564acbd685c…

MALICIOUS

PDF

85.0 KB Created: 2021-09-20 00:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f48d0476c77835e663c620129839c72c SHA-1: d1179dc0d2358c2c98c4acb41c0c9f88d63bad97 SHA-256: b45f2564acbd685c6531a0e13200694ad67d13bb579dfe44fc641ecf961d8b48
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload directories, suggesting an attempt to host malicious files or redirect users to phishing sites. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the heuristic findings strongly indicate a malicious intent to distribute further payloads or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144ba8d222cc---zesimovevujovapoxurud.pdf In PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/fisapatujikubepagaxin.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/ponuvafisuzefoxubulufimo.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140f6e9d2702---78851439751.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/33768744587.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/19731859191.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/dobafasivajaz.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/pufujuvigefuvasodij.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/kafumik.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/novebixijofutuv.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/wikezedelejile.pdfIn PDF document text
    • http://labotinnghia.com/img/files/78998975012.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea61312c18---22779978930.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/vupenezo.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/67397916941.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/nolutenaxujilod.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/64900131119.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9e6fd2ebd---dikek.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/b17iomm7aiakb7rhnf4a1ktbm1/12600726153.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/tezumijinepawobe.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/rijenora.pdfIn PDF document text
    • http://salwex.hu/file/toluwasubukagi.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145fe8de28f1---filotikobonebogubenobuzu.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/35026003854.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142abaf66a40---70439707563.pdfIn PDF document text
    • https://podimercrm.com/img/files/jubogedurubises.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=degree+of+loft+on+a+pitching+wedgePDF 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_off0000e549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE549 18448 bytes
SHA-256: 40cb6bec28cba2db35868cd3f004cd8ef7dc367525797e48bcc681452d4be6bd
font_01_sfnt_off0001153a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153A 10820 bytes
SHA-256: babc810fbb9de4354eca658dba00dcf4413b36ac0dd9bf6c8b639c41629481b7
font_02_sfnt_off00012df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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