Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd7fa9055eef7d7…

MALICIOUS

PDF

72.8 KB Created: 2021-09-29 09:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f8437b6006a2a2be3113a11a0ad1b69b SHA-1: 9420411dca467f3e853ff909e9916120e89b43ce SHA-256: 2fd7fa9055eef7d79874fd482524f86f0fddc937804a93c599cf6e8a5e08d6e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the conclusion that this PDF is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://pixomot.ru/uplcv?utm_term=jade+dynasty+full+movie+eng+sub+123movies PDF link annotation
    • http://aptwash.com/userData/ebizro_board/file/51540573376.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/19270150262.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/39069119903.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/futuregofemevikajurizi.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/69428720830.pdfIn PDF document text
    • http://atem.sciara.eu/public/upload/file/24675741414.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/72aa790c4c0f9c220bc8ba65ad5a7fd9/16982110761.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/jenetuwuvobababego.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/982a3satjf8n44i6q7jdr9foom/kalarebajum.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/refofowudexo.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/teboxotazawefutisegegiwek.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/22339594964.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d44ddc7ca2---86673254504.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/47660293862.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/215135213.pdfIn PDF document text
    • http://penzion.sarmo.cz/Images/file/72728637130.pdfIn PDF document text
    • http://wdnederland.nl/file/jetomopej.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/sojirifiwefifif.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151417544f6b---lonefegugataza.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/38687660587.pdfIn PDF document text
    • https://zzhqhi.com/d/files/panimiteti.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/9379010781.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/25/file/20210925_084709_185.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/70359736582.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb8a7e6b3e---romedatadodesibaxu.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/sejolofova.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_off0000b5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E2 17492 bytes
SHA-256: d9a93f2267342f0b06a571b5a30ed0cc3b38297a0d69ed503419f538f6e23dcf
font_01_sfnt_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 11352 bytes
SHA-256: df341b98519fcb94b5d4b9ab1917ab22c0bad3a701b6062f5183cb02b3e720bc
font_02_sfnt_off0000fcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1