Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3b3b5843984b00…

MALICIOUS

PDF

75.8 KB Created: 2021-06-22 22:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c2bbaf0f11dad556f7c66f650c9ff90b SHA-1: abba7f1c8b4d9a08cacc28ba53080620f4ab1c17 SHA-256: 6c3b3b5843984b00f6c29ec581b4434c3073eb63e23a8b4896ee920bcd957f2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many hosted on compromised WordPress sites, which likely serve as a link farm to direct users to malicious content. The embedded URLs and the nature of the heuristics suggest a phishing or scam attempt designed to redirect users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ketchas.ru/uplcv?utm_term=hungry+girl+pdf PDF link annotation
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607067b7d2ad3---kobasibipibitesim.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/98912731593.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/wojimegetuzutujevagesox.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/0769cd7834a78694995a74c18b4e7552/33447171149.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/10d3fa76feb38e57dffe74401c3dacca/60428503846.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/52e0120152612999dfdd7468f41ab890/54774668431.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/t0c7d4ql3evde6oh3f6o1571ch/52438774144.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8662847b2---xoxevejewil.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/1k8d35nm5rt0d5m9us115r1ht1/zifarupar.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/naxifavixozo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6924c608b---31565551619.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/fuzujajibeluluxumuze.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/4c1f073b0e8887977785fca0207c0680/woxofebiderabavepaf.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/xenudenipeboravunudulekuv.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077227ced00f---wivajajexakujodek.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/56432974585.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/b7facf06fac0cabd0a44d4f3a7c04380/23847757470.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/c2c1586734305d7e36e18cab77779304/tavibas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61C 4884 bytes
SHA-256: ebc31c5b46805decf1e85e68b3361ae69e406e6b294180f36d219c9574bf6bbd
font_01_sfnt_off0000f6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D3 13788 bytes
SHA-256: f8b261442cf74a36386cd281f3ae8b227c40d44308fefafb44e0f80b7d410214