Malicious PDF — malware analysis report

Static analysis result for SHA-256 63667a7305662a6b…

MALICIOUS

PDF

78.6 KB Created: 2021-09-12 04:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3a9780e3140273266740442b8c1dd9d0 SHA-1: 1c872602df2ee3587729db90e32667802df87e47 SHA-256: 63667a7305662a6bebb5862d0d2adc5477396d6c090105c1a59e523f044bf7fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://inwebjor.ru/uplcv?utm_term=gta+vai+city+apk PDF link annotation
    • https://topupdana.com/contents/files/guliduge.pdfIn PDF document text
    • http://uteambio.com/upload/files/kapevimofuteka.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/66701929089.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c01fe3bd3---wazavazurex.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/ramala.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/f01bd7d0305bf7edbbb281058123286a/bobarob.pdfIn PDF document text
    • http://cascad-trans.ru/files/vibika.pdfIn PDF document text
    • https://svilia.restavracia02.com/userfiles/file/kofigisej.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/rizavebuderibo.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/gegakekuwu.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/21748964425.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/68303893262.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/42843423397.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/56630778765.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/kiwamoxolofomojisoper.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/vatineluxebaxuvawasabadi.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/95296652519.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/73023866132.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631163741_b6cf19bfd2.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/25058933506.pdfIn PDF document text
    • https://whitesal.com/data/images/file/7349_20210905111524.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/vidinobofeg.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/hkrnag2ru4cg5jd9tdcece7km1/givifesagonur.pdfIn PDF document text
    • http://secretinvitation.net/images/files/mabikinapoluwedegu.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/34580485418.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e2ef3e98e---lewabibepuroji.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_off0000d17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 10008 bytes
SHA-256: e9250e591c177aee8322b82961fe701d28059152806f55514f00c36bc16bebd8
font_02_sfnt_off00010001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 17216 bytes
SHA-256: bd2fc270ca82868c7a085770204b7631745fcc434af45a9a530f18439ec426b9