Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e167f61de54759…

MALICIOUS

PDF

89.8 KB Created: 2021-07-01 18:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f603b728b86757527c3b92c53706a562 SHA-1: c78c461b1c4811ebaadba5052ca5ca102c132d1c SHA-256: 43e167f61de547590783076561614ea01befacc2111de15a8b01959382d37f71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The heuristic 'SE_URGENCY_LURE' indicates the document likely employs urgency tactics to prompt user interaction with these links. No scripts were extracted, but the presence of external URIs and compromised CMS uploads strongly suggests the PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://smidgel.ru/uplcv?utm_term=get+answer+of+any+question PDF link annotation
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2d7836199---regosovubupi.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b5644aab9af---fonozosoxasezewokafibopum.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/68298963811.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ff6db1520---26452761716.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608205658d68e---11248257048.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/utb7v6892jjhteegfm2m95bjd4/sabuwiremotu.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/kiump4b9njmmqngbfsnqv5cjuq/rojirekuborego.pdfIn PDF document text
    • http://tipiland.net/upload/file/faboxojewodezuto.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/3650duvkgbjj30fleadd4pdct4/lirageki.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607925052706b---2983415226.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608e504536f0b---lorokumotokijadorajavi.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/pepepalejalowuk.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/9a9812fdb905a55099fda3298b8c40ed/2808251803.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/jomasafixe.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/51b82a97ef5c4ef2b26bf448c285f462/290256522.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/maviwulofevonotoreweramut.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cc1cb36b2---bebobep.pdfIn PDF document text
    • https://patc.fr/imagesfile/57909924021.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/099a1b27f0e4facaa87bed530fc35b0a/87185287768.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/rutotafupinezisuvej.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/8ps2n776dvk6q0a8adgin8f1ll/26330846565.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2208650b2f---91945624034.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/jajaf.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/39795259233.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a89fcbd7e---1352837373.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_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11418 10648 bytes
SHA-256: 551ceefc6e1d501d02d473bdc485479745336dcad9dd5cfc4465963db103d00f
font_02_sfnt_off00012cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC3 17288 bytes
SHA-256: 7f4c9d682ac618e6694edba01f6559195fa8b4b602cc15d9c22e057dbb9dcd52