Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e551830ff6dd22…

MALICIOUS

PDF

94.3 KB Created: 2021-07-01 00:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cb21d2384b20ea268b667f9e7bbbe95 SHA-1: ba50da219c8a00f66f12c009ee0f9a54a50dea58 SHA-256: 91e551830ff6dd22a9cd5cb83ed7ac760229573337c9cea5137f486332361483
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=idea+and+ideology
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607883e0b1e13---99350379576.pdf
    • https://arrayamed.com/userfiles/file/67487397035.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1b97c91b7---93349381181.pdf
    • http://www.kickcommerce.com/userfiles/file/xazorasiku.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608707fcb809a---58424912723.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc18bbeb14---48964641530.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbce49986ee6d54fff5967c7aa43c4ff/zifutikuxupijuzilamunilix.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c63fcb98af---91431726781.pdf
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/wuzotir.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/mchtd0m13nuqi5bchi59084k4e/80441058216.pdf
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/82661ba88d62f194c1cfc160e3d2ae17/masodexalotugika.pdf
    • http://blankheich.de/images/uploads/file/55320962945.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/25a15afe01bc2f485e0b5c3e36146e85/narakutumegavokepoto.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/46191200059.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160852de86de68---gixarodelovako.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609427ccc7152---85005767605.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607848dd40a64---49656114416.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c947f08060---5859804736.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/3d0rfatc298tc07ia1t32gq7em/7883819751.pdf
    • https://koncnc.com/genelresimler/file/zivanovirejixekosoxi.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c7dd8d57---dipog.pdf
    • https://atlastoursntravels.com/userfiles/file/sipivoz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011346.bin
ccb7330b39d1bd1c69b3e7f1849f20f2f0f52616f7e417fcda7d22652c2b5e54
pdf-font-stream PDF embedded font (sfnt) at offset 0x11346 10124 bytes
font_01_sfnt_off000129b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129B5 16792 bytes
font_02_sfnt_off000141c7.bin
c8374c74f0e815d31165f03dc0a448d528375f141b7e69172145f6bc0897a4f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x141C7 16572 bytes