Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb38314645cbc85…

MALICIOUS

PDF

84.7 KB Created: 2021-09-17 16:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ee6b102834982a3ae87282e02a58534 SHA-1: c0f7c87792ca8ffeac9d9a2474cd066535c9dfb7 SHA-256: deb38314645cbc853fe177fb25dedb6905d0289925c9dec291ce4dbea66c8595
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous URLs were extracted, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a link farm designed to redirect users to potentially harmful sites.

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://ketchas.ru/uplcv?utm_term=ragdoll+doll+2 PDF link annotation
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/527af3225ed9b3d9d4692727fffb68a1/xabunipitelexigo.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/watufuvoxaluxipumukitakuf.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/88902592579.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/mokolerezu.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/vixef.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613df3697a845---deziroxur.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/rusinilonit.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/zesurinebofotevonagodi.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210904050439088.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/nutimovinetepovum.pdfIn PDF document text
    • http://4rrecycle.com/files/file/15141732632.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/bisirawivajixose.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219618261510.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/redetujuko.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21089197457.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161376d3e6afe3---vitunetavumapiko.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/jagubofosoz.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161310e788ea31---67887349136.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614006e231d1c---pikotivurodaxeludopogudot.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/61393579746.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/9596357889.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/87103534044.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/tazar.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/40723027059.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_off0000ea2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2D 17624 bytes
SHA-256: 3c7c65172a4177a026e2edea0800b9effecd4520a70562d29d9747412676798e
font_01_sfnt_off00011742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F58 9892 bytes
SHA-256: 61d29674dd42c6ec1305cc109b212c048a40957baf6566891554268097e5a844

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