Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6152ad9180d4ca3…

MALICIOUS

PDF

68.7 KB Created: 2021-09-27 03:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce810ef3376d430451affb7cc637ae1c SHA-1: 2e91e267ff8739d67f876e94e6e3ef7964caf117 SHA-256: c6152ad9180d4ca311f80e189959f0891c35b314579439e04a6d37504a0ab902
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to external URLs, with several pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huntic.ru/uplcv?utm_term=world+war+z+free+pdf PDF link annotation
    • http://laiyi-art.com/userfiles/file/18267900903.pdfIn PDF document text
    • https://tanvietnamdinh.com/uploads/files/vixinutu.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210916023602.pdfIn PDF document text
    • http://deltools.com/userfiles/file/fusamajunineni.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/78530317768.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/1835792333.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/9f06b2c3348d1a3e5bb912297c64ba33/25797421823.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/laralilebujotubozutuvivab.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/86752920646.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/13678894830.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/desuwiginerevaze.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/kupemawomojokam.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/r8cvu1aqm1ba4abavu1doabj72/40748747319.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/a44251647e688ea7ccd58fa8f96beaa8/mosejaxatonapopibij.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/82146111196.pdfIn PDF document text
    • http://teifsepahan.com/files/file/10457999698.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/9774778994.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/zamaxozedivibe.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff9cb3025b---fuxapurokuvig.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/44191218484.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/30369508434.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/barasurilaw.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_off0000b0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D7 10168 bytes
SHA-256: 0976cca39e202d21ea774397163b4dde87f2264c6737e983cd48aec13f83074e
font_01_sfnt_off0000c7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C2 14932 bytes
SHA-256: c8a900f17832f967f306160e66577df94ec1562099a4da744913e95e10a08af7
font_02_sfnt_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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