Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db9ab6e1baad6cc…

MALICIOUS

PDF

70.5 KB Created: 2021-10-04 05:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0a6ffee3b35fe82601aeb6ba9a900c8a SHA-1: abba32874d5fd0380030401fb402b16834fd643d SHA-256: 1db9ab6e1baad6cc1f88a9f7fedd751bf460b745f77c2e62834c9528baf9c908
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this assessment.

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://pistant.ru/uplcv?utm_term=midpoint+formula+to+calculate+price+elasticity+of+demand PDF link annotation
    • http://mylodge-naoshima.com/11092527206.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/74558226418.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/22695039734.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/dakaxogifofepube.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/mawuvewinuxaxafuwutimarek.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ff21028189---gopoke.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/popozakube.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137351a63448---47283659029.pdfIn PDF document text
    • https://fishboat.hr/files/donuzelezajata.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/94700856303.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/dedokivewowevafotedeju.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/fukotufewevodelotuvow.pdfIn PDF document text
    • https://panoramabyty.cz/content/15193714979.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/27074982037.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/42202313588.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/99772705773.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16143cc2c7e143---26049266449.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/toreludoli.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/75212606456.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/29098533878.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/xosuxokonezatitunometu.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/73539328235.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/wudosirawogofo.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/70929756642.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_off0000b0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E6 10988 bytes
SHA-256: bc08fadc241b443120ebc8d4a7d8f2e5e98f0d1994ae4f21cadc476d6094daf2
font_02_sfnt_off0000e271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE271 16176 bytes
SHA-256: c61c4870609ed1f291f56c1aa74e21efeebeecf425722c990e69c9895ab06bcc

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