Malicious PDF — malware analysis report

Static analysis result for SHA-256 53930d2d2ba1ca33…

MALICIOUS

PDF

85.3 KB Created: 2021-09-02 15:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d176c539121b78c9b136b20aa4d5c4dc SHA-1: dacd880d4bf831685009ed1bb6d7f8281265a372 SHA-256: 53930d2d2ba1ca33bfff925c9b80689a668ae081d4f3cf5bd9c475325cc3fb61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and numerous external links are indicative of a malicious PDF designed to lure users to malicious sites.

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 https://smidgel.ru/uplcv?utm_term=bayesian+data+analysis+gelman+pdf PDF link annotation
    • http://mfcwestenkwartier.nl/beta/userfiles/file/milugepem.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/34300190913.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/0dd7deef2f8b0af658e70f84bf03a2b3/mujovisof.pdfIn PDF document text
    • http://tyextractor.com/d/files/50483638775.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba74c42781c---45460280568.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/50546568492.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f12650072e5---rebulosuzupopop.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/47396465852.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611a85711bb5d---majerusobafijunekig.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/29339383748.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/30a31a6b7a9cf809f432a869672b4fa9/dunodadipenetavisikuloro.pdfIn PDF document text
    • https://cityface.cz/res/file/kunenesoduvev.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///muzalidoxeg.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/9931263640.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/5f055826b4def4bdec58f9e746bb9a43/45443637892.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/13197915664.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c580df1996---gaworomonunorisaribojimol.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/4690071273.pdfIn PDF document text
    • http://baudoinfamily.com/clients/f/fc/fc66627f90e8a365851b026dcf169025/File/marejajav.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9fc46b93a---94685346318.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/favunopatulaxegunepur.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14ee31aff---99430434858.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_off0000e6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E4 10788 bytes
SHA-256: db5fa4eb594411ae98a7490a858b6a8de377cf0963925edf9791c57eed303dd0
font_01_sfnt_off0000ff87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11799 18604 bytes
SHA-256: 3c5e463801025e7f44c467418253438b86c7f883954664aea0098a0c90fc08fe

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