Malicious PDF — malware analysis report

Static analysis result for SHA-256 337f4c62cc9468b0…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 12:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6443eb56e9ea3e9d2495746406e3a85c SHA-1: 4b0f5e54de148337a641b75d56555418bf7c154f SHA-256: 337f4c62cc9468b007b27bba03c5e9eb7c153538fef0d079128c0f4c12387f7f
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

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 http://otvorene-srdce.sk/userfiles/file/pexuxi.pdf In PDF document text
    • http://purofirstli.net/userfiles/file/1324974254.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/mh13srq3rjuk8k5hf5snec9f78/10538479020.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/0f587df7adbf88171d1ee62ebacfab5b/tejifig.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f71f4933038---51398685997.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160884b96d5d57---kopil.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b1971ce2b6729534333b6705a3c32f27/wenivozumiju.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/eabgpfh8c9g8hqlou2js9h3s2i/sorexulub.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/93223197654.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/66502849792.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/d0a1f46cfa6015ec9186e0f8964f892a/88013887725.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/64205433661.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/visuduxuromos.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/95926056475.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/xodaxuvuwu.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/guruluragifo.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/609fb8dc911346a87a956f4fb3e8953d/32360853150.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/siwimi.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/59350625243.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/47215975997.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/4d76da1d7e8726a95cd9b7baef702b86/14896403511.pdfIn PDF document text
    • http://markone-tools.com/upload/files/rutonoferexoxazoz.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/56617192087.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c78970fb8---62302024293.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/sabepafofusulelokofunapap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=extract+files+from+pdf+documentPDF link annotation
    • 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_off0000de5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 10964 bytes
SHA-256: cd6bf5c5fe7118a937490135f8cc10ad4bbe8206cf092e058966bb1aadb2f4d7
font_02_sfnt_off00010fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 17364 bytes
SHA-256: 4b5666e5792978e9f416ab1c1a993fd39c68e91659b5d03fb873469179645da3

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