Malicious PDF — malware analysis report

Static analysis result for SHA-256 85341f9c9c9d0b1e…

MALICIOUS

PDF

108.9 KB Created: 2021-07-20 06:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ce1fbec8aaa0d57608bb34814109d911 SHA-1: 1741527abfdf25dc9b1fd986813767ad50522cfa SHA-256: 85341f9c9c9d0b1e1026e20177f0072453faef81d0e36c26301d460ecd700c00
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both a machine learning classifier and ClamAV. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://nullemont.fr/nullemont/ckfinder/userfiles/files/27366279777.pdf In PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/53254334793.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609895ff8a048---86213363075.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/ede51d2d6e8af35ebb59d110ad42a2e7/42247711884.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/57794276734.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7baf2351f3207559ffd5433b55bf16a8/69058198546.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/genirexiwiralowatinal.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608de25784131---gipegakekebofunaguvatub.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kvho7jfvpph11a46gi57lq8oc3/20944157990.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/0nmhr5lfc1kpfc81dm3j9t5hvl/zakexasixadu.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/79341326531.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/gukepegesaduvowelop.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/uh5grtm39tbcvg28tu0ud9fgn0/1726630705.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/obt7ks1ntki8gs40ubp4btnq7f/dozoxexesoniwilesure.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6c0ab2dc3---17237502765.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/gejezomumegajujo.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf36f98b29---38620966295.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086611109588---71820235983.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f8edb38e---57556335433.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6ec33d00b---wumebojunekalutefunak.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cfd7e8e98---37368956589.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082bda19d3f9---3878111494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=foundations+that+support+higher+educationPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0a42d04b3e8782969f9fc75827dd31c2/ziwiguzepeg.pdfIn PDF document text
    • 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_off00014801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14801 10824 bytes
SHA-256: 91d25f81c8771eaa3891870cdd7d72b95a1ee6acc0bdfad7d2b99645d3a28452
font_01_sfnt_off000160b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000178cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178CB 17788 bytes
SHA-256: c7cf2e1c9e249ac9689e465d4a8b57f18aafb04ed85d7e378e30a572cc288f53

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