Malicious PDF — malware analysis report

Static analysis result for SHA-256 e485b8b04e22b170…

MALICIOUS

PDF

76.3 KB Created: 2021-09-13 03:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 806d7847b3cc19e9e8d49d7113786ffa SHA-1: 7572aefc2368462b6d0f59732e454dcf9ca00764 SHA-256: e485b8b04e22b170cb595b56bb5b0dd57f8800a08ae825843c5b5d956c6118a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to distribute malicious content or phish for information. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613deb4062417---34997480620.pdf In PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/taziforipikefeposuwupex.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/55708011729.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/qu6k8ko26vj35e3c0hd9gurbfu/kabofepekelexiligezomo.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/5082114154.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/69668376481.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/sevikigalokubodakugimuf.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/2408850130.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/wuxerepasajerukogegimuvir.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/7180132125.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/17289858189.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/12504864106.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/zoguzotikaxaboxajaxedew.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/pukefafowumomokujejexi.pdfIn PDF document text
    • http://ipublicity.cz/data/file/10240449142.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/sejuzumefuwafakoxodok.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/31bc2b8e156033c79aa7faaed1cdf1d0/69083256871.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137bcc439a2c---wikamasukoxebalel.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/bajivotovat.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/ralel.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/nisosu.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/98584316978.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/zesedizorizejurexob.pdfIn PDF document text
    • http://haphadoor.com/upload/files/mejiribisubetelirepinos.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/56955608114.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/28292156394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=superman+live+wallpaper+androidPDF 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_off0000c739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC739 17252 bytes
SHA-256: 3d8ebaa2ef0a18adc9bfc9f72ac9a14cbbc2a8b678b6dc75c2b27d48740bd124
font_01_sfnt_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 10616 bytes
SHA-256: 65f06d4379bfed0e1017d173b3e506bfc8b8decd010aa964c50456b50619fd6e
font_02_sfnt_off00010bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1