Malicious PDF — malware analysis report

Static analysis result for SHA-256 81edc90a69a4a145…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 12:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5d0b4671eb25c60332877097cac7bc50 SHA-1: 5c32ee13d65c904e130e7a6f0ef4662176744d31 SHA-256: 81edc90a69a4a1450279446d80a80a708d4cd21df2bd105359402fb55a54b1f4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to potentially compromised websites. The PDF contains numerous embedded URLs, some pointing to IP addresses and others to domains associated with content management system upload directories, suggesting an attempt to host malicious files. No scripts were extracted, but the presence of multiple external links and the nature of the heuristics strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://sushigonewildtogo.com/uploads/files/23834491857.pdf In PDF document text
    • http://trubaopt.ru/content/file/tazunovepipelapojo.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/92205660809.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/i0dlcrn59vhqgrbems3bhldjb5/lujaserosamuwokudemim.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141103c32c98---43411176262.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/bizigiminokugasorakijomok.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/58782051712.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613340a12506e---82666075306.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/77572115759.pdfIn PDF document text
    • http://93564497.com/userfiles/wudakopopokij.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/75475137244.pdfPDF link annotation
    • http://gewald.ru/content/Files/moduzikari.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/34579633409.pdfIn PDF document text
    • https://interangkorcondominium.com/userfiles/file/50006444134.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/fufulasevedus.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/wured.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/45507939911.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/vewojejaporogolemugesaneg.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/059ef0ec55e0fc50aa1f17a4c57d76e0/24120829600.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139050a936c4---karofilafalelolirozijupun.pdfIn PDF document text
    • http://tipiland.net/upload/file/gebopazuxorasidaxadonope.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146a3c936171---12067627206.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/jexupowo.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/97479176132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+remove+duplicate+apps+on+android+phonePDF link annotation
    • 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_off0000d7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F3 11024 bytes
SHA-256: 88bc45bb518795c528d36f5dd259e6c212fbdf51b89ec1cad3291d72b94b9686
font_01_sfnt_off0000f15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15A 16752 bytes
SHA-256: 3e24f68d42c4ed2c1aff67b92d59dc67319d82acaa159e612d4372fb6d53e8d2
font_02_sfnt_off00011c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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