Malicious PDF — malware analysis report

Static analysis result for SHA-256 617fde382f328cdf…

MALICIOUS

PDF

89.0 KB Created: 2021-09-14 21:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ff8e40eafc19e6fd899174d1d6721eb6 SHA-1: 20da54cea934e8a496ce4143988e74c1885459f4 SHA-256: 617fde382f328cdf0de87feceb82ccab299c6c084500a5a9fb20c535a37b40d2
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of these links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://oniceh.ru/uplcv?utm_term=clean+junk+files+android+phone PDF link annotation
    • http://9y.bfage.com/upload/files/20210904160950.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/wobopadelovomapeda.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/venilosipemunen.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161371c2e9fceb---58513296275.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/xuxosowevunojuxinomi.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/29596516240.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/kugesabakox.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134764c14f5d---gilojulumibumidojarapep.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/sixugiramatudeguwunas.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/18939102531.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/75241438222.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/25572546679.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/48282926814.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/norijumemebefixavekuk.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/3oinh30q3nfos1nsvubnnq99if/powipidefogejozetu.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/tezebenenoxatoxali.pdfIn PDF document text
    • http://delve-cr.com/uploads/90174666517.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109122107586328.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8c83d15a1451ec61d5936b9b512fcead/livuxu.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/zepisuji.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/98090411508.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/jinanofidivol.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/75880273690.pdfIn PDF document text
    • http://baove247.org/upload/files/36206803824.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb9c0d26c---88719176909.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/bifiv.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_off0000f522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D39 10852 bytes
SHA-256: 3ca35532e69ce196c2bf5e6cd1844b45795cde2faae8b894bda0e81058732e62
font_02_sfnt_off0001262a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262A 18488 bytes
SHA-256: 8cfc54b8f1f6dfb1db65be6ea2c9d82a4d38cd77a014268655ac21202e4df0ea

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