Malicious PDF — malware analysis report

Static analysis result for SHA-256 038c2976d4edd40c…

MALICIOUS

PDF

84.7 KB Created: 2021-09-04 11:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a5c807478d8944d2ba8160184bdc4adc SHA-1: dc5e9bc606741f3b52f2058c7837e2bbaf729e05 SHA-256: 038c2976d4edd40cf6e1b18c39b74f5156c5b4f9169de011bde2def18c2ed4a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=definition+of+evangelism+pdf PDF link annotation
    • http://www.supair-lux.hu/ckfinder/userfiles/files/64142176893.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/kc414aj5g8bhc9napkgeci51d4/bamejarezidumowenexok.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/bobefipawozosedivetuzit.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbb97738d5---zoxonex.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210726_2FA734D37DC278C3.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/17435224241.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/vipanoberirokenukumixuja.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/sazisesotogobamotijiv.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/fqc6gv6p458adlri6hcimmpirg/buzumunatajasalupitul.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095926598ee4---82842281466.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/19535360451.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/38894202530.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/1674hgu4f8saue3t8t6bg8hq9d/noripufevusamub.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/97106723641.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ci1lf79p3hi15gvhc74p20cvb8/xeluzexiposeferi.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/4db24fa748248e62d1bc374c907cd31a/wavubasixig.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/69039978187.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/jokedemawefolujigegoxonu.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/7cd4b4e4fbd828efdb29284554b04bd8/musefosos.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5f224cd58---46624328204.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609137fe99e9d---badusa.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/zovalewipiwaduvasesukij.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/lujizaxarinemuvasunafewi.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/47890193662.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_off0000dda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA8 10808 bytes
SHA-256: 4bd37adb4ccf84da3254e64c7ca67643b66ef9c32ee02f52d24ed557e7b7dc63
font_01_sfnt_off0000f661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF661 20992 bytes
SHA-256: a87f0a392d3bc23b9a87c4ac40f6447955bfa08ad7a831c854ee715e8620e6ce
font_02_sfnt_off00012d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1