Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4c77da946ab108…

MALICIOUS

PDF

75.7 KB Created: 2021-09-06 22:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cdcab0643c2a11f54f9757a59f41af5f SHA-1: cc92f28100b10908254202351348135e4f0701af SHA-256: bb4c77da946ab108b6f1cfab34721d21331b1123f657f6c2041b269b5f0f1606
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised or malicious websites. The presence of these link farms on potentially compromised CMS uploads indicates a sophisticated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=honda+fit+2018+manual+transmission PDF link annotation
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cede6a3e73---gekinusipiwaredo.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/kakopozogobejenevexig.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103dbe0e20e1---26868160989.pdfIn PDF document text
    • http://midospa.com/upload/files/lulawugup.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/695d654469523a200e28657001736220/23671112776.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/vadorijopufijij.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/a83d5bb117cdf6893d62e2c25fb2cec3/3455675341.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/oaefmtqibi14ggruq06tvbjki7/8265831164.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16074dc0b24e96---surezisovud.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/zixagi.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/3e3fe8c4f89418c1b36dc0a80a5edf2b/13555573568.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/b51b8972bc7efc4be716f3a53203602c/dupukinuzapevugosugafu.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/83821135518.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160834b542c627---8445893292.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/jekanurux.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a11085d648---94670511194.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/jitolufugatukilogit.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/dep7srleis6qth6hkbei7d7i90/24814473633.pdfIn PDF document text
    • http://hflchw.com/upload/file/1550726686.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/31337930967.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/27815813659.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854495dc704---legan.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/8852414015.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_off0000c145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC145 17768 bytes
SHA-256: 63679f61c644dbe872cebee0a9db1c20592bf3b83fa141f2cbcf0ed43f5df43f
font_01_sfnt_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 10976 bytes
SHA-256: c1b6158e5c12a62a44bf9f075f7872f2f3d0be3d00c3fc039b0240c66816eb6f
font_02_sfnt_off000108f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1