Malicious PDF — malware analysis report

Static analysis result for SHA-256 55168ca9a60db833…

MALICIOUS

PDF

92.7 KB Created: 2021-06-27 21:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bbc3ad64410db60c37673152beb8df92 SHA-1: 084048aaf88258ef9aa33c95cb134d17de29416e SHA-256: 55168ca9a60db8332828373162fe84f073a0c55a0c2ad0c270f27de3b0ac8677
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous links pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of a link farm on disposable hosting further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c39258ca98c---53994468918.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a949707acc7---52344438231.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e86e183ae9---2340717620.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778e4264c8b---loxuwewimusidelofugor.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608379e5736d5---xisuratumej.pdf
    • http://allycatering.com/userfiles/53510268099.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca1367af6b---95932709488.pdf
    • https://giverny-bkk.com/upload/files/dokixuvo.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898d57e92e0---zofutotukuxinat.pdf
    • http://nbpcpentecostalchurch.com/clients/65183/File/23672189776.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/6nlkg8km93k3a54f37mkvheb53/64477756905.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092780ccf1cc---xakojajuxibedupuguwejon.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eab5792a2---modipelasedavibupu.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9481e9705---luxegidesij.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ee7841b83---11034602754.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a07cdde0a8c---54301016791.pdf
    • http://cepsagibyachtfuels.com/images/photos/vifesovupotajuki.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/2mqnl2p60m71uddlr439cubdha/zomuvufid.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608050a7078bc---33526681011.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa75d5b52e2---wozexakiroxobaguxak.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/d0c216d5e940659b8af0cec4975477e1/pasoda.pdf
    • http://wenxuezj.com/images/File/88769624102.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=suppose+meaning+in+kannada
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D9 16792 bytes
font_01_sfnt_off00011beb.bin
7f40b3cda2b2258cb8c43288c6ccc07859967870bdb4a3006d443c79330318f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEB 19332 bytes
font_02_sfnt_off00014d64.bin
b3d7b63e0353ef6fe8a3e54b75ce207cf988b666861c29b9158d41061d8d1168		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D64 10756 bytes

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