Malicious PDF — malware analysis report

Static analysis result for SHA-256 740f9f343c0da3f5…

MALICIOUS

PDF

103.3 KB Created: 2021-07-02 06:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 209e86139ac0d3e15eacea8c503bd6f7 SHA-1: 68155a0f4635934b47fb5533cb355fe317c26a45 SHA-256: 740f9f343c0da3f5cfe6a30b0add44d653d934488fb119da0f5d9a397a34d56f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The primary function seems to be acting as a link farm to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://medvor.ru/uplcv?utm_term=10th+class+science+practical+book+in+marathi PDF link annotation
    • https://alshaabcoop.com/userfiles/file/nigoli.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021061817140163.pdfIn PDF document text
    • http://berbun.com/user_img/file/kobomasawiramewixumepoj.pdfIn PDF document text
    • http://jaatkinson.com/userimages/gogejefiwow.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/kanosewatuxi.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bd9f78752---jarifulalaver.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/b01cf2f6a6ebfbec97db531dbc286209/zoputefelifudepadarujiba.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd985164ae---budifanesosigaxalej.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72b60061bc---98843918613.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607284d83a885---zevimedewufujuziguv.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/86267884323.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/vonofumalixatopu.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/17798569386.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/31c8d042b16d86f54e8055572bf0dbf3/lonowuxetatesixasufokini.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/fuwedusasekemopexonux.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdcdd95e39---68581177992.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/15288109961.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/xajivutofiru.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f3dd20ea4---woxidokulupew.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/rijadegedit.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/junupokemekakitiruwejama.pdfIn PDF document text
    • https://noddy.nu/images/file/99820499502.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a82860ba769---80757667507.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/72316601444.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/59737353702.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_off00012cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000144e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E4 18336 bytes
SHA-256: 121a5e15e1a931b1ce425a6b68ecd4b2e4b47f3d3d43d18645234d71df6f9399
font_02_sfnt_off00017499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17499 10948 bytes
SHA-256: 5093dc149a57cf9b987a9aebaa0d17e2175005a4bf1775604ae04907517b5717

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