Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0462b87e52b019…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 17:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2bbdf9d8f09c11ee4833d11232ab1602 SHA-1: f26fd9c0ed47caedd8dba043fa90a02b8795e728 SHA-256: cf0462b87e52b01933659697ead4b9bc4ce8fa324d8ea10d0f61b33be79a0c82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as hosting for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing additional malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=dictionnaire+technique+du+petrole+anglais+francais+pdf PDF link annotation
    • https://iva-vietnam.com/userfiles/file/55369559718.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/1910434c59db47774b191e02abbb3c78/tafegataniwira.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7df7377e02---59732912752.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/spf09klvtmqtvno3724rdmjapr/55834546597.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/cb5501ad26d41f2bd8d4d53409ac6a6d/85436687149.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc1f19064b---98213023199.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/bobosuw.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/36a2cfd5e8674c79c09f598d207501f6/21644355857.pdfIn PDF document text
    • http://keiganproductions.com/clients/863431/File/47957571308.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/64923884042.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/80901561575.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///xalaropegifibawekeweji.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900addc71d4---wabofesatuxokemitidafamex.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f0c6a6479---soxix.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/fezowep.pdfIn PDF document text
    • http://renovator.cz/files/file/25522305674.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/28643698295.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/93252699991.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/skb7lpjinps9sf38usmp4rnmc4/26539729525.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/65672661000.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771c21b4ed4---95733053677.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/91186974218.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/25169134250.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/f7l78sgauvhhnoea8vhd91nhk5/98974443024.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/53716730188.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_off0000d774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD774 11148 bytes
SHA-256: 13fd0706b0160195ebe8433c71c3949b8287b79ef339b69aabd3157b6c6ae6c5
font_01_sfnt_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 19232 bytes
SHA-256: f95f37ded083b0f9bcff5c0cc21a08b067b701575a79ee5dab7ce56625962e3e
font_02_sfnt_off00012095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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