Malicious PDF — malware analysis report

Static analysis result for SHA-256 35cd1a268d21fff2…

MALICIOUS

PDF

91.9 KB Created: 2021-08-14 03:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b8f31b9562d99e8722e42a1876ac9206 SHA-1: bd010d739abdaeac134c9eaa9ab9b53fb434208d SHA-256: 35cd1a268d21fff2e5cc90f204a734292f74e7a8bacb4e0da863810594d08d2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristics point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=does+sugar+free+soda+make+you+gain+weight PDF link annotation
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1bda1f97c---jenugibaxoneruri.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160df951dbc100---ruxomoluxeg.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607940971ec3c---gamuzusu.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/nizuduxewabejofewatov.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/6835743895.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/29651025373.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/zumaxi.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/5d7d0bf260ea45b9209a8ab6cbd80c7e/gewidasewex.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/64100566909.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/81217908132.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/28218113027.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/tewubexemutiniwuwo.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/23061100568.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/42156041092.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccae01ca67---sapun.pdfIn PDF document text
    • http://446888.top/userfiles/file/98371557862.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/54095631619.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/giviropebedoxilapi.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/kasasixa.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/beguzelavexoz.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/tafasirafoxu.pdfIn PDF document text
    • http://air-ned.com/uploads/files/wuvuzavuloxiseb.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/22e2391e5115533d1244322a59146fb8/fonube.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_off00010107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10107 17068 bytes
SHA-256: 422fe325854e0f00d682e4bd3f1cc902b79c78c8b9bed1d20bf06f43f949a98d
font_01_sfnt_off00012d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D88 11148 bytes
SHA-256: bcb51764050b156d9ed189ca3b01fc4dc5e77d6e7836fe82b658010cfb64d285
font_02_sfnt_off00014746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14746 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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