Malicious PDF — malware analysis report

Static analysis result for SHA-256 585767cae20f579c…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 23:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 51ce60ef14adee4fd60953ae6f61a3c0 SHA-1: 694427cafbec7e81457df789e3ea4d1983b7caf8 SHA-256: 585767cae20f579c5bdc4b4a0c305d46c9cc67d23c8433e3be98ae0ea92e6991
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=android+application+development+london PDF link annotation
    • http://perilatomsk.ru/ckfinder/userfiles/files/98183003999.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/kilekenabisozakaximuxur.pdfIn PDF document text
    • http://vodnik48.ru/content/file/besekolibot.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/870bd8cc06429e6ea60385c969a73200/limanemoxuvufalowuf.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/66927808774.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/39236911603.pdfIn PDF document text
    • http://rnralpha.cz/res/file/bunebaxiwerizetita.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52108548202.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/58843292531.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/zamufarezupitovagetobabu.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/pimububejisobavoraguzunun.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/xavarapunewomibex.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/85427347050.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/60947939265.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/lobazejur.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/16242674061.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8207ad942---25841061036.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/vulutilosinawuwemaxunixu.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/gobenapakotarorikabumuko.pdfIn PDF document text
    • http://spakimthi.com/upload/files/24089135648.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/99770348083.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140ddc6d0a1e---rodeluvevela.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/vikoxaxaketozesutagam.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/67801157649.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_off0000b309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB309 17368 bytes
SHA-256: 87a68bc89aa5672f6141ee9d83f70f3655748bd7e755b6203cea9bf90fa19f78
font_01_sfnt_off0000df6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 10556 bytes
SHA-256: 7d4c9ab0449439e033059be046b2196e5a73721c31b3c7c87509a7ff0638af98