Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f2a58a107afe6c…

MALICIOUS

PDF

87.4 KB Created: 2021-07-28 11:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 337ae9731744fb6adf56dcfef09ecb9e SHA-1: 2eef36f317f7a3bb113a890c317fc64cca768865 SHA-256: 09f2a58a107afe6c874aadc3e1da7e47bbba19a3dd58e8cb51f826d572305dcc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The primary attack vector appears to be directing users through these compromised sites to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37ad8a0616---jamuvemediwala.pdf In PDF document text
    • http://alpha-cp.com/userfiles/file/jujikenevurudexo.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/6238501946.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b117ef375f5428008c0279e1e9d87b28/getizotujebegovilerakal.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/51702598103.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/fekabudititobuvosagono.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/ng6vgm16squh0t116cc6ki01mv/99801068897.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/pifosojug.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091514146fd0---57564198498.pdfIn PDF document text
    • http://nfc.soo.jp/file/15787507737.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/tafiwonekenugemolawe.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/57191947799.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/21e5ac66e1a46f0e18fb16c052bdaee1/58242825964.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/72821714231.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c6cfb5319a787eafd86bea63ae2acc4d/lemunedorunolu.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e9c3de777---46514551710.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/741950df04af7e019553f6714bc2bce0/xirolofuxidenevitobo.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/99721297367.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/pibedaledezunewalalu.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4fa410967---86171264961.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/oac1j654ri1l1insmo26576r7q/83227558708.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/l4i843kgh3op2p2hl9s4v076s2/32021766020.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f476e97dc40d5153bbfb8eafbfe94280/jevip.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b6fd884ef---27088102264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=english+grammar+test+advanced+pdfPDF 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_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 17380 bytes
SHA-256: 59fe661615f441d1fdaea81fb639e19db916781909d1a090f80dd5e1b40c5b84
font_01_sfnt_off00011dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEE 10996 bytes
SHA-256: 011e30ad90940e1403da2b8a4b8e223e4a169280c2c77f394a650f42283ceb72
font_02_sfnt_off00013711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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