Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c4725d98d7931f…

MALICIOUS

PDF

91.0 KB Created: 2021-08-26 00:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c051cf6baa15d72880b9eb09b3ec2b34 SHA-1: 4d4e1e373bb1529fd9718366e9ea19e3f25ba3ec SHA-256: f6c4725d98d7931f220ec792f94b814b7fd6cf8ac00d793cf785a9af6a1d8c83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a5be73fe38d790f9e95764ebcf4dee90/wuwegujetusawubuxad.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/14ca3a91fb5760e6f1b4ef5d1d2bf60d/3694997070.pdf
    • http://thedreaminitiative.org/Content/Admin/uploads/files/23566917592.pdf
    • http://thingsantiquesla.com/userfiles/files/winesu.pdf
    • http://teechart.com/uploads/images/files/magigitide.pdf
    • http://minhvuongthuphap.com/upload/ck/files/dawesegevisa.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1bfddb5b4---93941853370.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/fqlcfa56dkpu1imtcc230igqh4/faxabuwukegubuwiluxusad.pdf
    • https://www.comperat-89.fr/ckfinder/userfiles/files/37860708193.pdf
    • https://grandplaza.bg/uploads/assets/file/xewotuzuxikeje.pdf
    • http://ultrabeauty-ff.ru/userfiles/file/jopobewemajufo.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6afc60c9c0---31012426297.pdf
    • http://first-group.kr/ckupload/files/tarukoxunofatet.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607671dd8a544---tefebuka.pdf
    • http://perfekttorun.pl/pliki/marukibolevakorip.pdf
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/vinobejif.pdf
    • https://dichvumoinoi.com/ckfinder/userfiles/files/91074474230.pdf
    • http://sun-eko.eu/files/file/7271429731.pdf
    • http://24cvety.ru/upload/files/98680464522.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=tributaries+of+abay+river
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e560.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE560 16792 bytes
font_01_sfnt_off0000fd71.bin
2318a54ab38dc423df3f48609d7fa21b2b862bb0ebc024caaf6271895d54a2e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 16956 bytes
font_02_sfnt_off00011602.bin
1695d20dd728d84e0b45c88564f8b49d39c24cd03c446eaecc5a0cb20fdec16d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11602 10440 bytes
font_03_sfnt_off00012dea.bin
3216cbf4ea825b85a08bd890d9587f743cb054e906b84cbc74a5f6d521e6d937		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEA 18684 bytes

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