Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f31db01c5c7f74d…

MALICIOUS

PDF

82.9 KB Created: 2021-07-14 07:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f98dca6178e4336371bd5b77d451b432 SHA-1: a75f9c12db8dbc7897ae5597611b7d368281543e SHA-256: 7f31db01c5c7f74d3ac2050dbf5d545fb1c7a7a0a5a8be08f1be380143314e55
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1140 Deobfuscate/Decode Files or Information T1071.001 Web Protocols

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan. The presence of a 'Security Bypass' heuristic indicates the document attempts to instruct the user to disable antivirus software. Additionally, multiple heuristics point to the document being part of a link farm hosted on compromised CMS uploads, likely directing users to malicious content. No scripts were extracted, but the overall structure suggests a phishing or credential harvesting attempt.

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://dzbnf.com/upload/file///49631286813.pdf In PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/33f9303529f322f43204219f2487667f/liwirivafepisexevujulugu.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37167a2899---36766094728.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b3d75dfef---rimudexonakiwavuwogaj.pdfIn PDF document text
    • http://carszana.com/image/upload/File/58199693567.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cad14dca2---sadunedot.pdfIn PDF document text
    • http://yuhongzg.com/d/files/zemepekanunonejumat.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b0782ce4612f9ebc497fa9715e802289/vokazerajara.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0704644001623844081.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/74240396801.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071750babdc4---13546320678.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/0e0d550d4d954d185a505fe19ee8f396/80718881194.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/85268447758.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/fb651a6d99ac17dd0baf5583655d9c92/66717170108.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/9e4t9sovhgd0l6fuik1iekls3a/32226696212.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ed5bde2ac2545007edabef8871e8ea24/gujoxaworunawaxibalo.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0673a0e20---zagatipudexowupamozataj.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607821783eaba---71344621456.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/miredavojevadoki.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/kafofibaxasemejirimoruwog.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106250119487468.pdfIn PDF document text
    • https://kede.org/userfiles/file/12409447663.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/met44uapk68nd213hkkpp2kdk0/80118217315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=adobe+pdf+creation+cannot+continuePDF 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_off0000dfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 17740 bytes
SHA-256: b04f19619053c48f26bfe64e010fe309d6719a88dd75b6287a0f50ad536675d1
font_02_sfnt_off00012640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12640 10620 bytes
SHA-256: b87679ea83be96b318470f5385a6c5d24644be08e0cff3e47b297d9bb49262bb

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