Malicious PDF — malware analysis report

Static analysis result for SHA-256 12261c5e12daf98f…

MALICIOUS

PDF

82.2 KB Created: 2021-07-28 01:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 91247e6c8fdb982dafc22e279186937d SHA-1: 1fe036acaf9ee5bf2902e5532a7a8a502ecd9bdf SHA-256: 12261c5e12daf98f81bba82b7ad896cc3e0bcdfe9db628ed8fd1de24f3f8d142
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern observed is the use of a link farm within a PDF document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://grandchainfamilyfoundation.org/clients/85333/File/pelosonu.pdf In PDF document text
    • https://sgotomotiv.org/upload/files/68428714865.pdfIn PDF document text
    • https://ckmandarin.com/uploads/medekit.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/viximetelagutijefara.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/tinoxenawugujenebime.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/sesak.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608054fc5882f---23724597520.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/38615823640.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/11833989729.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/77d3f3ec3d8dd61f7d2757261d1c3e80/jejonulanutato.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/solavagadefotimasogimex.pdfIn PDF document text
    • http://alkanboya.com/files/file///pufajexigov.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/gfbsfvd9vrc6iltiovlr1bcj52/78488646331.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/lsdo1sp0r2n3qtrv5f8q7pmmco/femoripudadasag.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/nezut.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/cffe6610365c5ef95c85f713c3421cbd/mobevexeterixo.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/f2uh539sv9hbd231cvcjaj3l95/gagifevojodilobi.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/45496306135.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/narosokoporupaxu.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/a7210df27de5eb1e85a841b6c084be06/lutevimusotepep.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/66465601592.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/59346950625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=cuanto+equivale+1+decimetro+en+metrosPDF 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_off0000daa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA7 10924 bytes
SHA-256: ea076dbeaaca7d20adeccf61eb92f074d3d7a83f0dd2e03b7a6d9709b9c8948e
font_01_sfnt_off0000f3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEA 17480 bytes
SHA-256: 162125b609084535d77ed0322b79dd7163a8a6752fc4a4e2c8fd0490abfde3d6

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