Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d38d5d70dbe1430…

MALICIOUS

PDF

83.6 KB Created: 2021-09-15 14:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc2b685df2668323dae899a88b2ceea5 SHA-1: 06ef9ad2999ab71cdfd6404faaca217d24c82acd SHA-256: 8d38d5d70dbe1430c029e0dd73e0b2d77a234adfb89cbc63087eda6d3e4160e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=android+studio+project+example PDF link annotation
    • http://geyikkimya.com/userfiles/upload/file/wivezuvidafowuj.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/93218034203.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/99651610008.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/fh43f9pc4ig24ptp36q24al9ve/81639251527.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/14267221961.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/23120539647.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/nerexenofebu.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/14122221848.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/nafatir.pdfIn PDF document text
    • http://specialcats.nl/media/files/60026895276.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/14006497354.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/votapixofotojakudevudek.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/fixuverelimogejujubet.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/rizoninivoporibo.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109110550118965.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/86543582438.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9b116b4269674ae92b425b7b7fe8f8e4/107167687.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/21758166748.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef3cd7dc91---58142228266.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/92790359059.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613daaff8e595---58525578243.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131fd772ba8b---betewobasura.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210910110534.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/9495478160.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_off0000db15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB15 20320 bytes
SHA-256: 59fa5272c2dadaea3b4e44046bdac1e74ec7dcd320f29d846152127c25c1901d
font_01_sfnt_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 10988 bytes
SHA-256: ba867b5933b474a1d7b86f01517c7720832aaf06aa00b458b54bd50cdcc20fe4
font_02_sfnt_off00012898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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