Malicious PDF — malware analysis report

Static analysis result for SHA-256 5921dc45b72e5e53…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 17:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b447ab36dbca65de05207e4b57683f3c SHA-1: 95764502d7f7f5ec98ef6717311d52c8bc890ecf SHA-256: 5921dc45b72e5e5305c6b5921f3130e7db4565601536758de6ff616803e38466
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript and numerous external links. Several heuristics indicate that these links are part of a link farm, with some pointing to raw IP addresses and others to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 8

  • 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.
  • 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://eghamatkade.com/basefile/eghamatkadecom/files/gukabet.pdf
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/ravisutaxuxudoduj.pdf
    • http://albino-pitti.com/pub_img/file/36412775928.pdf
    • http://rucodelniza.ru/userfiles/file/goxofesutakotinuxum.pdf
    • http://fszhenjia.com/upfolder/e/files/20210925193835.pdf
    • http://dailyxedayhang.com/userfiles/files/29334651433.pdf
    • http://myapartment.de/web/editor/files/jewonomavozumusodagasomuw.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/ad30c6b9faf402af3550016424454e17/96629251977.pdf
    • http://www.uc-kushiro.net/images/library/File/29763257950.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e9208447cc9de6923bec56bcafc3ccdf/jedebufowafixex.pdf
    • http://cherryontop.pl/upload/fotki/file/mafawov.pdf
    • https://idd.no/ckfinder/userfiles/files/89216565790.pdf
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/fusodolugojiviwolokuvet.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613396b928e6f---89921805297.pdf
    • https://banderlogclub.ru/Files/file/kelote.pdf
    • http://hiroi-es.info/yamituki-n/uploads/files/32913534941.pdf
    • http://realfootball.gr/userfiles/file/viwozisososafobopovi.pdf
    • https://penzion-pod-rozhlednou.cz/img/file/xeboj.pdf
    • http://asckhn.com/acskhn/userfiles/file/vusuxevetiwudefulikisuwa.pdf
    • http://ucokampen.com/media/files/fowaputoxapamuke.pdf
    • http://bluecars.pl/userfiles/file/viniza.pdf
    • http://finchamauto.com/pics/ziguzusetiwagoka.pdf
    • https://uangraja.com/contents/files/99658359244.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141400d6869b---pobojinunuwipituxivofasis.pdf
    • http://fastbeatbattlerider.saint-fun.com/assets/upload/files/6834862525.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141710dca9c5---13248464721.pdf
    • http://tatugigo.com/ckfinder/userfiles/files/bezefutoribidigokig.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=turkey+gif+funny
    • 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_off0000b36b.bin
54183c041da7c6e5203d42ff25a556b53c3c70c57290bbfa1524aed6e9234672		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB36B 14836 bytes
font_01_sfnt_off0000d8bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BB 16792 bytes
font_02_sfnt_off0000f0d2.bin
17cc1bb0b0e2c2e9c5abf0d85b1aca178c438d921a17098e04b7ec5c01e53438		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 10064 bytes

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