Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6bd03515287405…

MALICIOUS

PDF

70.8 KB Created: 2021-09-05 09:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9cb25e0cdfe05b11f7bf246eff52b8ee SHA-1: 2b09200a8025f742892e0c1e333c94376cc980fb SHA-256: bd6bd035152874051413d40682f9f0bffcf90434d823795110009b4c9cee08d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on compromised or disposable domains, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. No scripts were extracted, but the presence of numerous URLs indicates a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=ultimate+ears+megaboom+3+user+manual PDF link annotation
    • http://www.eau-msu.ru/ckfinder/userfiles/files/36129258282.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160f34837724dd---39277585657.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/25153388143.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/53965152371.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/gamufalizezibezaveza.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/vilewedovawasev.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/40032851532.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/63652c1d27335c8cea8d41c982aa2b77/55804625621.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2073287e---84434388730.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/72694270195.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cf1cecf7e---guvike.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/govaboxazib.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095137d1a369---10679547911.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/6356043266.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/nafuvidusifi.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/51031657338.pdfIn PDF document text
    • https://andrejc.si/files/file/2066755921.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/54482644877.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/fononas.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26a2a82483---jebegavafejuzozitigeletu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/69988940756.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/jufabiwetekitin.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/baxekafedifutakado.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c598b81a71---tonolevutijopixakeniniwep.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/b80e59b61c1320ba2e32e4b1a6e83570/7278313338.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_off0000b5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E4 15172 bytes
SHA-256: 8dc8fb7b043fc8290e8ce9d7fbea91363855a18a5a2fbad77854dfa59eaa9011
font_01_sfnt_off0000dbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 10868 bytes
SHA-256: 83997cc89066518941cbc06192b39a35c9e5498f63e643164a731e3b0481703f