Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85aee0f3be2a11a…

MALICIOUS

PDF

71.7 KB Created: 2021-09-12 05:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 03dce3fa85b12eb51191ac70d7323d6d SHA-1: 308b19be68fa53c02c9a755bdb794853960d0e3d SHA-256: f85aee0f3be2a11a04a7a9a4633c9125fbc38b28384b293ebfb1872f8451bdab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The primary attack pattern involves luring users through a malicious attachment to a site that then redirects them to other potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://tsegypt.com/file/kikutinogebewepikaz.pdf In PDF document text
    • http://fullx.net/files/viledixudanolabuvu.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/52aea0520b46a6abb21e93c1fb3b9329/diwivitegebewokoteparok.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/xovozasofopame.pdfIn PDF document text
    • http://dges.in/userfiles/file/zitaru.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/46165935706.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613829887cfa6---35889245452.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/60704541973.pdfIn PDF document text
    • http://ciskmv.com/css/file/tiruvizifurutororazawo.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/85934375945.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/goxaku.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/31921677591.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/memogerosen.pdfIn PDF document text
    • http://checopharma.com/upload/files/riluli.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nivasizolazofevurug.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/vubobiw.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161301ee842f72---18883741712.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/fikavajumakopabefemusu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329dd86e085---52668113688.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137d0f233204---nulunikodigimopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=2017+friv+gamesPDF link annotation
    • 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_off0000b6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFA 16640 bytes
SHA-256: db0999a6810a0309f9e467199db1b7bda698f7be358737d9dfa48e0e38bdbfa4
font_02_sfnt_off0000f9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 10500 bytes
SHA-256: ac2117b9e476fb2afc0d45266a18d8312fbbede47817cd9c27b212ec412c8d22