Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d37f38b1efb43b…

MALICIOUS

PDF

86.6 KB Created: 2021-08-28 17:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fa48dca0c2c5acff0675a817d4a3bbc2 SHA-1: b9341e4d0cfa22112786384f1df0cd39976187d4 SHA-256: f8d37f38b1efb43b016c9f499cd998a37b9d3709778a0e2d79670f1788f6454b
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm pointing to compromised CMS upload storage, and ClamAV detected it as a phishing trojan. The embedded URLs are likely used to redirect users to malicious sites for phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607b57e9cdb07---39208057056.pdf In PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/21a873b2723e8716c5b7bfd03ce55627/juxuvakaputokomesizuke.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/muxarasuxijojaruno.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fea11095dd119934bff7a99e9c8baf41/tipunajozilibofagusulus.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/96772535229.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/puragadifofi.pdfIn PDF document text
    • https://animaliadielisa.com/file/wotopibe.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/676b46485c52d8449cf6bbf957cc9ac9/8579917774.pdfIn PDF document text
    • http://gabortech.com/admin/file/debelisapa.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f477eda05b---4544864400.pdfIn PDF document text
    • https://kawanmto.com/contents//files/88484717516.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/wetowive.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/83439363283.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706493073c3---vowinidodoxumes.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/58392209112.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfaf1c5f537---25447875559.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/vuwegan.pdfIn PDF document text
    • https://melz-feu.ru/upload/wozemivuwagejezawemeri.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac33e7003e8---dunavofupijidujarezozi.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809f0e5ffeb---xuxezakuzapolevalire.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcb0c58222---32465073641.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/14865975791.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/44651915290.pdfIn PDF document text
    • http://mayjack.com/upload/files/67457364488.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/16124899844.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/25008532752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=meaning+of+alonePDF 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_off0000f2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 10016 bytes
SHA-256: 1cc540ee06bdc5bb42d32ca8e267f5afd14c8916a17793d4add8209a587c39d8
font_01_sfnt_off00010926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12138 16984 bytes
SHA-256: ce28b50e85f387a8d5f6a8ea61c3da8a79a3bcd426cd9e6a4c64a6224676f143

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