Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b61f703c814b6d8…

MALICIOUS

PDF

88.9 KB Created: 2021-07-07 03:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67fa953422959f24a14a29f91ab097aa SHA-1: 728a3daf95da363d91bef03348d79bb1d280f16d SHA-256: 3b61f703c814b6d8bd4c5e6a94ab30c3a3361909585974a1f397868bf6a4d86d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • 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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729472cb50f---funezukel.pdf
    • http://aquatherm-graz.at/files/zojediv.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1lft6kvnd2bec55bcsfb0qpgts/lakutabewobenijapu.pdf
    • https://autoteam.in/ckfinder/userfiles/files/tiwibare.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c241bf03fe0---zerad.pdf
    • http://qkmedica.com/uploads/userfiles/file/mevada.pdf
    • https://viticoltura-enologia.com/file/52693802999.pdf
    • http://vonkoenigsmund.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d06e79d2e3---pabumonusukapezubasup.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/5f12159564aeb6be5bdf005eff36dc29/60436273084.pdf
    • http://pechati-piter.ru/userfiles/file/45096781317.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944a02c1c4f---11724810504.pdf
    • https://chung-pei.com/userfiles/file/15574756911.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/483fd4708a5e1c08315fe2dddde99d7b/80544477236.pdf
    • http://apnorajasthan.net/userfiles/file/56791843469.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/92bd750da93c181da2da6c8d0e411e24/84088157548.pdf
    • http://easyreturn.store/userfiles/file/metidatodewowupabiwubawus.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16077aa62a37fe---fipazutovisimi.pdf
    • http://sy-smile.com/upload/files/42551822545.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a71be16600---93878144037.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/t09bco9f3socouk3k87jgv1ste/9191710080.pdf
    • https://betalinktech.com/blmedia/file/volalerobepugewevatukorom.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ffb78a7e1---88617082296.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1255d9c996b09c103e99634313d83a27/27926346185.pdf
    • https://oklasik.com/ckfinder/userfiles/files/35823386120.pdf
    • http://krevue.cz/UserFiles/File/47946341162.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=all+the+naruto+shippuden+movies+in+order
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4a2.bin
54e0cb95d81c42a921605a24b58de8281b9b9edc8b30fcdb9fa4b2c9053b8186
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 17924 bytes
font_01_sfnt_off00012337.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12337 16792 bytes
font_02_sfnt_off00013b4e.bin
29b7909ac89efe486711fffed44df3c4c036ef580b760eb9bc0623de8f978381
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4E 10804 bytes