Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9e70258ff04c5d…

MALICIOUS

PDF

96.2 KB Created: 2021-08-03 16:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c0a538154cee49e6fb58117964c53830 SHA-1: 2163088acb95d45c88337afd072247c26f8250fa SHA-256: 1c9e70258ff04c5dda422cbdd32c42e9141c6c6ee30f0e1ba227c565cc69ce3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7fac59bef1135c00741ba8b50f0d7e7c/68631968300.pdf In PDF document text
    • http://kassa.pl/userfiles/file/xapefu.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/4765586010.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/warepamonidupopofuwolob.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3b9dd67e4---manedubazidasodavu.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/19242060321.pdfIn PDF document text
    • http://anpo.vn/upload/files/debejovimomovolu.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/xazetebevewapuwisifafov.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/56320200053.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/6872312383.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/9a0e68066ad165a3b6146eaad6827ba2/37417810916.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12ce9c5ecf---lipif.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7f663491d9afca86ef1c998fe837e518/fipegolinadumuzu.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c2e12f4db---bamaxosurav.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7e7a0ef29---89295477087.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e5cd826d8---tutuzufodoboxumixomugora.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/49019358286.pdfIn PDF document text
    • http://broeinest.org/ckfinder/userfiles/files/42042050779.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/lnjmena5b3ccsamkg6gi76g3af/felej.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/nemejaselujijejitarafaxe.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210701214941.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/40aff318e063ab4f6e193a26207229c5/widuwalatavaxogunuwumenos.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///74719190825.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/10762285536.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/41628130869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ubqari+magazine+january+2018+pdf+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 20348 bytes
SHA-256: 0dcff6cd0ffa1e1cdb4ced21bb37a0519d14969b7af823b7b64cd3058dc11a10
font_02_sfnt_off000126fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FC 17532 bytes
SHA-256: 7e0070cb9227acfb2ae27aea938a5a9ec8c18634a3c863b5c205e6bdc8670960
font_03_sfnt_off00015496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15496 11860 bytes
SHA-256: 68fdfe1e848a4aaeebb5a6ec9c27fa42111d665685060718b7c4b208e7c1c283

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