Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5597d74e131e6d…

MALICIOUS

PDF

80.8 KB Created: 2021-09-23 01:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0c42d8916df856d41bc593aa20ef5dbd SHA-1: bf22f8797a0ad14e4ee0b29137573ea971f531dc SHA-256: 5c5597d74e131e6d98205e8bd55f3ed889b870402e43e0e335581d93e71c554a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The embedded JavaScript stream suggests potential for malicious actions, such as redirecting users to phishing sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crewmak.ru/uplcv?utm_term=apk+search+engine PDF link annotation
    • http://markasib.ru/ckfinder/userfiles/files/tuwuvigexoge.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/8632993571.pdfIn PDF document text
    • http://air-ned.com/uploads/files/7789573326.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea3c9574da---xawudojefurobodino.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/lijojosa.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/zuzosebejasi.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/riwajenu.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/kiril.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a06e3bf2b---zutowomekejapubojonovesu.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/dazatizemur.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/fokiwufuje.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/64119535115.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/lugigagovujexopepoxujonu.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b69390a5ba---xobowegogunozajitetu.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/vojorodajev.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/golirakulogopusile.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/xenogaf.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/60842263128.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/xubapatelepexesokuj.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/46652173340.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/xakav.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/jenasino.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/15460807251.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_off0000d9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B2 10464 bytes
SHA-256: 61f39bee39c682d2077e43e0b90ae84af39b463f432a24ab77a34c4e0e52e1f5
font_01_sfnt_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 17252 bytes
SHA-256: d86a84b018f5b92c190ad6d464ed20d3b72f0dc3dbf8a7a27f4040f8a6ff03af
font_02_sfnt_off00011e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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