Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5abdb4693df26f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 16:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a6583d029a562f2d461e5d8684887d8e SHA-1: 5625ef8c6501a37497eae60dcd844aa1516e2431 SHA-256: fc5abdb4693df26f35e1ba9a63b9d081bd947023660c2c4a084bbc47e3a5e8f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=pan+card+correction+form+new+format+pdf PDF link annotation
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c4aa7c04d088a5eaa8ced5eab5fe8ba3/26062601560.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/60cdf2aa8a62c6e08cc0bc433a3978e9/salogadeko.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/39789739691.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/zupupukinabugifaj.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/3882d5a3dd83820e2101a021ed01c910/90408564048.pdfIn PDF document text
    • http://ymmicro.com/files/files/95559635693.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-7-27/20210727160003991996.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/e1hj19r1q3qdf24j7v7qthdtk3/6055688234.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/nixuvekupigirera.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/48717559223.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/78967445033.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084d43860260---felarolidekuradiwofukuw.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607221adc9884---befutemad.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/woxujudomowowawopa.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/guragubabebugukovubipox.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/fufirikimiratuti.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/95115456564.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/asirapetekapavezovuxafo.pdfIn PDF document text
    • http://www.seja.lv/assets/ckfinder/core/connector/php/uploads/files/saziridit.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/rejofurovowupugujo.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/14468080342.pdfIn PDF document text
    • http://chayka-svg.ru/files/27465868507.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/foxaxakipetifoz.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/d0uls3qt1j4jn39dud1mu7e8v0/29859454063.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/dewixoxijutufosufiguz.pdfIn PDF document text
    • 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_off0000e28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28F 18400 bytes
SHA-256: 178333b1b23c35c90e604523b0da9eecf3a9e0cb536e94c56c30306dd98392db
font_01_sfnt_off00011198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11198 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AF 10656 bytes
SHA-256: a8935ebbecbe81c1c72d9ab6b4e263bfa00d273dba373aaa79989fc676d757e9

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