Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd5c59da9bc2dc7…

MALICIOUS

PDF

126.3 KB Created: 2021-09-08 12:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: debd66016615fa0c7edbe7200b24d9f7 SHA-1: 4caa14a4ed6f835ffce90abfd5e7b2f5604108bd SHA-256: dfd5c59da9bc2dc731269d38244175a782de3e7eff3ff6ccfc1ef25d527e4aae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://inwebjor.ru/uplcv?utm_term=circles+ellipses+and+hyperbolas+worksheet PDF link annotation
    • http://10glazsikeyrosa.ru/file/worobazerenefaxukem.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d42abe2d518---bukofesaja.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/50931193ebd31e5b4e0618c41f82f6c6/nadaxor.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bdedff6cb3f---mafetavinava.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11470ea80f---rotajajafifibifo.pdfIn PDF document text
    • http://jimmartinfamilyreunion.com/clients/35696/File/74837746479.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/dd70a04f2d844b9496cc6fb91575d407/xiwawekibunamub.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/39770fb7a9a0ba299350d77379d595b0/9889539597.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/95574253506.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/2hdk5t344u4vjtjv34dequoku0/bimafatupadoxu.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/93289861011.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/moxavitugufesizuto.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a8699adc4e53f13ee511b397a1569796/99990239472.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pizabepiwutoluzu.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132719e1a95d---xipisi.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210904/file/16307073566720.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/d29198510a957feeab080fe8a69b3161/20551961031.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d1f26ef1555d33ac45072f5d9395fcb1/samaneberesot.pdfIn PDF document text
    • http://rhondachem.com/d/files/tosukatena.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/nt8fhdh7l2r3pb691241r859r4/17040395898.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14003925208.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611533cad6d2b---gikujiwovi.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/vefozuzuxiwofukulurajofo.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/2ht6n3ckfi87d7g5ob966us9h5/92438412526.pdfIn PDF document text
    • 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_off000184c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184C9 11076 bytes
SHA-256: d2630faf783f310e866709f8a13326505635116e0e0e33a701abf6047d56cce8
font_01_sfnt_off00019e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B67A 20016 bytes
SHA-256: 59459c90f7a21e760e95493f764e90546599b68d6d644855d7077b1e26100d35

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