Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfdfff2b91ea9b29…

MALICIOUS

PDF

86.3 KB Created: 2021-06-25 16:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ecc6c7927c18dedcd8a63079432b023 SHA-1: 019a75f34f390c465dea106967e997dbae8d9e1c SHA-256: cfdfff2b91ea9b29fe8de0f43d70e67518e6d424ba5ad2ade88ce9383eb34e1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS uploads or disposable domains. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35cc9d6766---80278579215.pdf
    • http://yjsyrj.com/userfiles/file/13450062157.pdf
    • http://ecovn.vn/uploads/news_file/panibaga.pdf
    • http://kiavysocina.cz/UserFiles/File/loxamujamuzukavifolize.pdf
    • https://parc-hotel.info/file/joxofonibe.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078984d1c914---55051746809.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073e27b9f144---93550482220.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160bd48d60049f---7021611126.pdf
    • https://airshow-bg.com/file/sawotibaziwobemofaka.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/hu20nonj8sg7a27c197ehlikbr/8778646263.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/9tdpr6huuq2lan1p8puvv8abgc/74389561108.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/af7c20663cce6a300798b4947381950a/fazesatowebijiduselu.pdf
    • https://discoverthesky.it/file/2013808317.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d09bc25e76e---sijux.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/6d8d2206c4700f3ef4b2d85354eb9dba/73748060966.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=goodbye+uncle+rest+in+peace
    • 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_off0000f0d8.bin
f228d7d9c010e75910934fc2a18fa7d797a754a9f6a48197899e12571a79c900		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 16684 bytes
font_01_sfnt_off00011ba3.bin
ab001fb12699893be4d549384f755cdcffb5953f24226213d35786390b5baff5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA3 10900 bytes
font_02_sfnt_off000134d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134D1 16792 bytes

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