Malicious PDF — malware analysis report

Static analysis result for SHA-256 7565942aa293e922…

MALICIOUS

PDF

73.7 KB Created: 2021-09-13 16:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d5834fbe8230154b0b4addad099ba10 SHA-1: dd715e744a1c99cd016175aaddabe5070c4585b6 SHA-256: 7565942aa293e92296e3bc49ab5b4a9172a5d8451871624e89544064b4479584
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 other PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content or lead users to phishing sites. The presence of external URI heuristics and link farm detection further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=real+bike+racing+hack+mod+apk PDF link annotation
    • https://gulamanis.com/contents/files/vijogexen.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/witedisobebakopa.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/mitinemawej.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/18229150626.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb760b8c6---73155608911.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/neretufetafisarumu.pdfIn PDF document text
    • https://heyratacademy.ir/file/temafiwixafa.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/77224843831.pdfIn PDF document text
    • http://keyday.ru/files/files/vamovufekasokunufeb.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7bc7d4571---9423334805.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/38147229404.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/72775950086.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/42518297636.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/a5c94114b26b3babc582a88b2b182cef.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/juxezak.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/wekulerer.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/86068505367.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/zogokelakudofu.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/45399872106.pdfIn PDF document text
    • https://led7.ru/file/viletizoka.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161324542e1e97---79152057457.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e616fb43540af2917eebaf69d4eeeae/divivoxijebula.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/39356168739.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/32464134576.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/40fe36923417d8255c7cea89031a6e0d/wuvigugakanizuxetivi.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_off0000be70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE70 16176 bytes
SHA-256: 041ecb863fddba96668cfa21e1c2d879a08f06066f38801259bda5c530514189
font_01_sfnt_off0000e7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE5 10972 bytes
SHA-256: 7291746981bd6e775435682422d917175ca84160ab63d9a0822f6b64022bfd53

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