Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8a88153b43d6c3…

MALICIOUS

PDF

102.0 KB Created: 2021-09-05 05:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 674f054b90191f5c3d071ec6cb54f4ab SHA-1: 46c891b06238d45b4ac4455c584e40ba610da680 SHA-256: cd8a88153b43d6c30445bbd91a06778b60dc663c1401273a20610b2c610e812c
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests that the document may be intended to trick users into downloading a password-protected archive, a common tactic to bypass security gateways.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://coretry.ru/uplcv?utm_term=hsk+level+5+sample+test+pdf PDF link annotation
    • https://hospvetcentral.pt/site/upload/file/guluzuzepeverufajozi.pdfIn PDF document text
    • http://burchiellati.com./file_fck/file/gejotezilafet.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/lilaloduz.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4c685dcff---77987716770.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b101a00132b---gobaler.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/38042844447.pdfIn PDF document text
    • http://partnercable.com/files/kaneremowokusofarawud.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/pexudax.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/9195044726.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/63387722190.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/tifaguralafagutamot.pdfIn PDF document text
    • http://chichen.asia/ckfinder/userfiles/files/giruxavavatofevegi.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/36511035829.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/90207355588.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/2963770253.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/26e650c825dd686eb38f2c30f56a84c5/9064295043.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/14068395567.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/fc9ekuv9hm5hafd6n63ctp7q2n/redorowujajazem.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/87082823066.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a22eca0c9be---37218139157.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/jubede.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/durisabij.pdfIn PDF document text
    • http://dgjst.com/upfile/file/pidaduxinar.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D31 25732 bytes
SHA-256: 07f9491d9f764cc9a39d18f033a3a0b40aeb246cf9be490e10ca4c95b2a1b5cd
font_01_sfnt_off00014e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16666 10524 bytes
SHA-256: a3f60d14d1a1470c2f1d8df7d5a86a82db87ae4b88ec021a2400797c25d48d54
font_03_sfnt_off00017e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E73 2092 bytes
SHA-256: 9928f80fd1d2d0d36ea5bf07de62848821f2d4524819f09451307f7ad47ead41

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