Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4fd66ec50b02ab…

MALICIOUS

PDF

85.1 KB Created: 2021-07-09 07:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cfe8772e8e58fa169e132498ca8ad735 SHA-1: 253808bee51501654f8d76a10dd9a778dcdc5155 SHA-256: 3f4fd66ec50b02ab8d58d437ff7fadb33ebeb70e21f5917d1856530134deee38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, directing users to compromised websites. Heuristics indicate these links are used to host further malicious PDFs and are likely part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://irlanc.ru/uplcv?utm_term=1+stanza+poem+about+family PDF link annotation
    • https://rsun.pro/admin/ckfinder/userfiles/files/777819407.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/9b4f616f4ec405d09477ffb3e39b9e6b/63793130365.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ttpq8prlk8bos60isqh3o46kdd/17198880614.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/evql432d71u7f5jibsdjt3gp71/94871942485.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/womunajexig.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52f631ec9a---36258951494.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/zikebafe.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/vezurusukawelo.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd8d12a6a3---38739789228.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8adca2c01e9937bfc5440478f507b40c/ruwitepokivepos.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fc4e7d4d9---35643457898.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/beradolud.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/8779154331.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/30f9aa2bd605ed575ae4a35112e4942b/limoniwibafufu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b380db5ab85---68082015641.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a231477436d---65163307335.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/morejeriwogewaromosoxez.pdfIn PDF document text
    • http://614move.com/clients/4890/File/wakuduxa.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/11184543831.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/83303223420.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/46808689089.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/1e5e0385cbf063f054f4551098ffc7df/94686192268.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/4s9abqp28drcc1993nk9d0c0d1/magadugul.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/79313512474.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/mefosidujalikosikame.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_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 10788 bytes
SHA-256: da2388b73acdea31916c959d581d70f4c5751767cb2da9521889e0c788a9e4d2
font_01_sfnt_off000102d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D4 17012 bytes
SHA-256: d4f3d371fdaa6a8f2c725af510dd7f10171cd4d0692c97e82270a2462f215660
font_02_sfnt_off00012f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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