Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3c9e26eecdd7d8…

MALICIOUS

PDF

93.5 KB Created: 2021-07-18 06:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4a09d6cf3dfcd885625ef44f20d08e46 SHA-1: 251d2ff5c1e2225dd63267dedb15adb38d6c557b SHA-256: ca3c9e26eecdd7d8ac8292f5a98e16788bc6d9c164e019968453096eb2f9bee8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to other PDFs hosted on compromised or disposable web infrastructure, likely as part of a phishing or scam campaign. The presence of invoice-related language further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7e919d84---6924502460.pdf In PDF document text
    • http://agendatourvietnam.com/hinhanh/file/dimikofaravobujura.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f86a3efb6---34275321491.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/lcihn6jcmljt7vhdb51la7nk4f/tonegetiwufabopuseru.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/41028757266.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/m2d459fg96m808qp1f7f7onjfp/salubilitataluxobuxa.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/7vi29gcv18isciu1b9olvubf64/zuramujubugudifut.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2c3aab01a---89783672007.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/cf1c1a724484d21ba1688b9e949b8337/6363911242.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/6in1mim96nvv71k340sau3cls7/gofamibibidibavavinulozo.pdfIn PDF document text
    • https://coluer.ir/documents/file/xexinuxobedok.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a7aa6cdd0---megojodafokezevupugug.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607622b6f4050---vejadi.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076514e98251---38065484382.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/bekanujimegojev.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081b73a37883---98198390337.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/29026628409.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f363e100a6---kirej.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4d52580ce---32074289983.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e91087c2b---fuxagonubejimuvuf.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/zovopi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b052146e66c---jeparawunefimusixegunolix.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d639e53f4f0---regijudejupenuj.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/4fedmok1f41g0cjl9l832l31m5/56997061756.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/11826984813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=funny+thank+you+message+for+birthday+wishesPDF 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_off00010839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001204b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204B 17736 bytes
SHA-256: 52b18aac2255eb4aec667b72bba86db00c3d16ffd8563a38df08856229e830b7
font_02_sfnt_off00014efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EFB 11264 bytes
SHA-256: 109c3d62457c91dab514095cb1196dbd683ceb5da73bd295f726688ea14258d0

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