Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e0e5505dfeadb4…

MALICIOUS

PDF

77.3 KB Created: 2021-09-17 17:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 974014c848faeeb335527b1dcdf27268 SHA-1: f55cee42a231cc82ecd3a4efb6916b3517b45ac0 SHA-256: 15e0e5505dfeadb4626ea6ab7731feb30d14469206c77f20fe9749c7fe45ac86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are part of link farms on disposable or compromised hosting, suggesting an attempt to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall structure points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=gta+vice+city+cheats+app+download+for+android PDF link annotation
    • https://flomogroup.com/upload/files/xudemaduj.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/xikojufifiri.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161381db85fd69---salabufixobivebu.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/nixeriz.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/fotuwaneke.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/298854897.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/fijadix.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1692319151613c760c6ab2a.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613164c98c722---54966213027.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdac43b308---wololivoro.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/fibekumopuxakuxuvogadoger.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/61686010674.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/junaret.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/badunalemofijejafuv.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/11128607015.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/91604749729.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/jenupabukokavajebe.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/2273257942.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/94567472811.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/jonibedifezuzejorobuneran.pdfIn PDF document text
    • https://promise-land.com/upload/file/39969439129.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210903_EEA2BC9941F4297E.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/35064315929.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb430db8b0---17383442860.pdfIn PDF document text
    • https://sujatasfoodopolis.com/ckfinder/userfiles/files/60017511181.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_off0000c7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EB 17532 bytes
SHA-256: 7b3937562a51516b220949727f51fff9f20bc5ebbf13c3a9cecfaafc1c060a72
font_01_sfnt_off0000f565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF565 11024 bytes
SHA-256: 3d1df5b7753e84aef340062bfebfff6e61b115726947b6091d78a3ae4f3170a0
font_02_sfnt_off00010f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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