Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc235d60f077bb5…

MALICIOUS

PDF

68.0 KB Created: 2021-10-09 00:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9d3c12c5997c5fca708cdb2968afdda2 SHA-1: a5ffd5e1afcc1cbf6d21d0fe5ace1e57f8ace3e2 SHA-256: afc235d60f077bb53bb630baf8737c89ba1500c2ab6e19f19fa60acc99140a48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://philabc.ru/uplcv?utm_term=manager+interview+answers PDF link annotation
    • https://envirotechindia.net/admin/userfiles/file/degetelavenuximofonava.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/dumetefigiw.pdfIn PDF document text
    • https://deepex.hu/hirek/files/kedobixefirazufujop.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16147810b4000f---81090768197.pdfIn PDF document text
    • https://km2804.com/ckupload/files/1960292438.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/tawapavevanibemudujug.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/bisipifonutekegob.pdfIn PDF document text
    • http://blueyee.com/upload/file/280605208771.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/lileruzukik.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/fapimagajamizagig.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/28413771186.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/57884325499.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/87663812084.pdfIn PDF document text
    • http://termocity.by/pics/files/nonasopabiz.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/95816549986.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/wazemidekuz.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/28057374038.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/fodavekoz.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133ae1384bb9---munajim.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/15895930985.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158645049d63---donix.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/83078714595.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_off0000ae64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE64 14716 bytes
SHA-256: 79e8cf85e4908ecd85628ede6a3062bf39cc3894b5d22dfe2b73d329cfa5a849
font_01_sfnt_off0000d390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD390 10260 bytes
SHA-256: 802ddab0c1625222c3163b24a57b9db3668c78ee0d2999c139f6908da7b781af
font_02_sfnt_off0000eacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1