Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c8eaad3acfc5cf…

MALICIOUS

PDF

85.4 KB Created: 2021-09-03 18:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6ce7397108cd72f153ae4c429f529646 SHA-1: 2d6b21ace020a383555dadec4756fa978da67eaf SHA-256: b3c8eaad3acfc5cf6019502bdd6a7379da963aeb459ee2e2c541cd942bc67e72
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 ClamAV detection and an ML classifier. It contains numerous links, many of which point to compromised or disposable hosting domains, suggesting a link farm designed to lure users to malicious content. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ce1069632c3d1bda96d3d7af0ab66bd7/rimag.pdf In PDF document text
    • http://rapabzenec.cz/obrazky/files/tadototuvuxepat.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5325f10a9---83526364932.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/vazutafikurukemuson.pdfIn PDF document text
    • http://teifsepahan.com/files/file/68956636861.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/1386282925.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/zitugomikujikedalolavufiz.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/gogorubosupabitigigo.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/42080864947.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/0c1a844312b7d6a7c430f6e0cb185b4d/26029265888.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/dujubopeluzofasafejisal.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160898912ebf7b---61820628624.pdfIn PDF document text
    • https://drsaman.com/files/fonogotadapilubujigizo.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/xesofiwipegovowovof.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/3987937421.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64d676f134---libifosevukuxat.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/rugajososonalakumotijug.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16125575c4e6c0---30143244701.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4d16a8566---9318794529.pdfIn PDF document text
    • https://kaisar168.com/contents//files/mugiwumexagejovasim.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/4cd42b91ef0284314c2e161ad48c84bf/66429204564.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a22ba9a83---dozumipizerefisaxekomiva.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/85976900744.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/73373189052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=garbage+chute+design+pdfPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/26720211932.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_off0000e94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94F 17696 bytes
SHA-256: 52c1cc360aa0d839eb3fefac04b2eee240cba92c5b65810bf42c50ed676a21b2
font_01_sfnt_off000116de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF5 11012 bytes
SHA-256: 6a25b2c3aba8bd13012b292f11f7ca18f604bd162629afe2bc6d2c2b5f9f3a39