Malicious PDF — malware analysis report

Static analysis result for SHA-256 98dd2e59c9f7a55b…

MALICIOUS

PDF

86.8 KB Created: 2021-09-01 15:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 07a787b0c1cbd68e35f7b793b77134bd SHA-1: 3c0da8b7792b362e7fdee9797fce2d05bf4e0fbf SHA-256: 98dd2e59c9f7a55bb726501e8d02d9bfc4d63120c9f18894fa6459e5437d0e35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme, likely involving a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/2471a7088150eb7c6ef76d9ee7852535/98527459672.pdf In PDF document text
    • http://riskhedgetech.com/uploaded/file/3747102086098f9827379f.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/muvatuvokebubuke.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/lasawomigi.pdfIn PDF document text
    • https://digireg.cz/upload/sogatek.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/93359682674.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/38222744268.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/gikepazewokiwu.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/fevodali.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/tedagidinoxemex.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/danojazudabaxaboluranamaw.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3f0748d4---sasunanukaxu.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dd61c7f66---kalujoluxojekepejede.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/labimasavapodew.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609750e3626b1---25376398504.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3a761fb83---pimaniv.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/93674540533.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/mizomurakebugujibo.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/sabusuxurigesepa.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103cc120d9f5---63323497003.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/wofowejofapevef.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/aa26756bbc1d917d90ddb3e8f1c9f3a0/tatagamowelafarese.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ne76rotnl7683qh1rkl1cnic85/77706356500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=kabali+full+movie+download+in+movierulzPDF 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_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 17468 bytes
SHA-256: 2d807e23384ed6793b55dc0e51e7e2ff7ad22ecdcdc6385e1557c8d1fcb4719b
font_01_sfnt_off00011b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13394 10692 bytes
SHA-256: e41b83d9cc483ce741387f9345b9839bc42614bab736c61b223a87fa1fdfff5b