Malicious PDF — malware analysis report

Static analysis result for SHA-256 430a3c6cd6152463…

MALICIOUS

PDF

78.7 KB Created: 2021-08-27 18:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e3bb2ab00361e28328aa3e62f887a38a SHA-1: 9905f4885646c02f63ba0bea37cd0524713dbeb5 SHA-256: 430a3c6cd6152463b473b9e27bd1ac60a8a3f74d4230fa7d037111ea4e40b238
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to various domains, some of which appear to be compromised WordPress sites. The embedded URLs and the overall structure suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://chcial.ru/uplcv?utm_term=strawberry+sauce+for+cheesecake PDF link annotation
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/76e1a13d646605528de6a778840508af/kobivapomolelinikifadon.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210523040516.pdfIn PDF document text
    • http://sciattella.net/images/file/23064297177.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/mutav.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/dawet.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/xexidudavidilufijo.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/50716249885.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b455bb186af---dafowopurikaloj.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/86115963178.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae938eb2c3---95292687467.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/xawoxafajawewap.pdfIn PDF document text
    • http://bkairconditioner.com/uploads/files/5260000961.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/ba851765ae6f484a472f24c9eea86fcf/70298583964.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/16215413073.pdfIn PDF document text
    • https://banghenails.com/upload/file/45512032790.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/dinekametowojabivosami.pdfIn PDF document text
    • https://southafricapools.com/contents//files/togojisofarojeti.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/zenapiwomepomif.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/98f7218e328cb2b105299ee73ce52a2a/gemunapomasegikol.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/1784559267.pdfIn PDF document text
    • http://web68s.com/upload/files/45865848335.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/fn4kp16sij5d2957eej8nbclkm/11736757884.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16093b5a00b072---bibowekukopezabafidat.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_off0000ce78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE78 17744 bytes
SHA-256: acaf8e02cea0d965f0f758782518ead015cc78d7811b285e20ae4b5d5b84efda
font_01_sfnt_off0000fc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001149e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149E 10796 bytes
SHA-256: 57309d46fdb5a352629eb305dbf22c90ae85e16ce10b0bc9bb70e0f4f66f9cea

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