Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7090375965c017…

MALICIOUS

PDF

85.7 KB Created: 2021-08-15 23:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8758dc9c6f4e33c177998cec8598d844 SHA-1: 17c943e0e242f1f62d0c758e1fe1c25ff7faa6c0 SHA-256: bd7090375965c017a36a966ad4769dc9845afcaf01d85e8e97efa858714cf496
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites hosted on disposable domains. The PDF's structure and embedded URLs suggest it is used to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/gutaqqh9necocvpc38mqnq6nsm/91954692910.pdf In PDF document text
    • http://arkystudio.eu/userfiles/files/18817921254.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083f036486b1---kujaxobiweluziduve.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/bifewekufupupitivegobibux.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/83596513477.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/1be94ba867dd9ee644865decc78ab6c7/86762246718.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/ngofjuf635659abv5hjpehrutb/4631171890.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/nitigadas.pdfIn PDF document text
    • https://atl-50.com/files/file/90023638295.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/zirotuwisobikuliparedi.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/r2vu21c6lvefru14m2ioso488q/tubipowof.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/e9ab173c532f04d9865552b3a1ace15d/17542540470.pdfIn PDF document text
    • https://ms01bet.com/contents//files/lubilosonem.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d64552065b---dazitiziburufuzobito.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/3af02abb64fd13f2cab02f1d2dbc028d/mosopematefes.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0d84a1466935650d876b17b1ba95a699/xadud.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/47739396168.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/laziwe.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/22263881624.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/uuj8kvqlfbt43dn52cudthdo8r/xofidafepagimexuxabamil.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/7d1p3itaa7p6s82to92hegojne/86631492157.pdfIn PDF document text
    • https://chptravel.ir/data/file/92106185844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=capital+budgeting+problems+pdfPDF 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_off0000ea6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6D 11112 bytes
SHA-256: 9015d0f6e13ea201713d496921a9e3a9d00a146208546ddb276811be8725128f
font_01_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 17144 bytes
SHA-256: b7f7c25bdf7c15abac1e1dd8433271021c358484bd7b5e86cdfea2e831734e09
font_02_sfnt_off000130d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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