Malicious PDF — malware analysis report

Static analysis result for SHA-256 528638a17f0702ad…

MALICIOUS

PDF

175.7 KB Created: 2021-08-08 04:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d9f18322559140862828b73e824833b4 SHA-1: 94f0c42c925efee68b59ead1d6674b66f878f2ba SHA-256: 528638a17f0702ad7d5e0c9ea10a006a2378cf98af7e3cb586adf4aca896f285
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded links that point to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9171

Heuristics 5

  • 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
  • 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://queure.ru/uplcv?utm_term=valery+altamar+biografia+wikipedia PDF link annotation
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ba78f147645b63a87e4579db2b78a2b0/34650912578.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/nifegaxoropirafabefituf.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608562c46c2c1---43842687437.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/mf3q7msis4an9rjasm6d25c90h/jetepifopepazitux.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bb7260ff5---pirazujavet.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/xaniwuxozunur.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/35764254814.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/rizetosugowit.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610480232ea7d---97313873812.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/43711380751.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/73a1168e301e069fd03990414c707a79/mozuxotoxasikomijiru.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076655892d8e---fugumarosilirevi.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/manopudup.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/savakefoxotofo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/kdnpbdjdqnq99iejosj6ihfpm6/pabofijuwilajumuju.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20ed901389---baredelifojifiton.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5819082894---17581812748.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210627234146.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/rdq1o7gdptchjj0gjni9jcu6o3/16449779494.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/8or4pmuoq1gs4kjgjmo2sno741/redorobuvibekufozibum.pdfIn PDF document text
    • http://finchamauto.com/pics/refitoratafulox.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/94377355912.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00028782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00029f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29F99 10968 bytes
SHA-256: ff62b423ec5db6b6321b815f2cd87ac61db811ce7082556b252d25922517f70d

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