Malicious PDF — malware analysis report

Static analysis result for SHA-256 f962a31596fa4dc6…

MALICIOUS

PDF

91.4 KB Created: 2021-08-14 08:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 62f2a7b9fcba6644374306f142e35165 SHA-1: 0d4a615bc690842406b36340425e3e4733654b68 SHA-256: f962a31596fa4dc639528bda4e67f783b577365783f596dedee83c69a13eee4d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://garglob.ru/uplcv?utm_term=soundcloud+pro+apk+ios+free PDF link annotation
    • https://hoangnhataudio.vn/media/files/nojetiluku.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3aceb8a18---67464377825.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c887c65e0b8---59015756244.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c6301bc73---wotijiru.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/dc009df9d5b1713bd2cd1610e8699bd0/16686577252.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/bilixikoliwuveguwududeku.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/78024c7de674a6e14e6d6cc911c83b97/wufuzonig.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952a7aa59d8---solofegebelotugevimema.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03917d01c9---rebirawitu.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/32275248947.pdfIn PDF document text
    • http://sam-global.info/files/file/36904432469.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/xanepogoxavewubiseli.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/9155990d87021afed7ea5dc431beda78/942777457.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948ee9bdb2d---48485903688.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/1620957912216.pdfIn PDF document text
    • https://khanikango.in/file/69982839158.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/94873326995.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/20244960430.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/rizibeke.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/31848137037.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/54129d3a724bf04e3855208a7d2dbd82/busatonuxukudi.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021080520500457.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f226461734456c59fbbdbe9903537bcf/35621142445.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/3574499247.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/xuwajalijuzijas.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_off0000fd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD97 17632 bytes
SHA-256: c0edd34c0a2b379e580f846121a9b08b59bc1d0a315b1922fb98528ed90cfc15
font_01_sfnt_off00012c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C16 10780 bytes
SHA-256: 78956651d906083d9edcd4ff512742bcf517bb1809d7ed91e01379276b83fbdc
font_02_sfnt_off00014504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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