Malicious PDF — malware analysis report

Static analysis result for SHA-256 783bb1277b57bbfc…

MALICIOUS

PDF

81.7 KB Created: 2021-08-16 19:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4f304cf1e4c9b016d4572b400c72320a SHA-1: 8458c89f6d7c6a58e0e5e2a0da520a428e38f397 SHA-256: 783bb1277b57bbfcbc35ffa2110ef93615497eeef8e64d44155fb92406e2d41c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to a compromised WordPress upload directory, suggesting it's used to distribute or redirect to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdca244950f---marubexuwuxomi.pdf In PDF document text
    • http://j-line.ca/fck_upload/file/72198238428.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/zanesepemevuwapepugute.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021062117451770554.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/pobewivugokerifusurom.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/pivefifupidoluwak.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/91079298956.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/kewuzuxikilejolirobasu.pdfIn PDF document text
    • http://twtime.com/uploads/files/202108160657338404.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/zurosaji.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ffa0ea2e0---90192526458.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/zebivixab.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/2264182669.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/jubodolivitizofid.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/sumisad.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/82690224635.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160d35e7d8ce99---86326645393.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/sobixites.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85251010114.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/paromidilirusajatefowe.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/99869886615.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815f872fa96---13859943958.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/40367120026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=bose+wave+soundtouch+music+system+iv+bluetooth+adapterPDF 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_off0000da1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1C 17136 bytes
SHA-256: 96c355f7cc1a71b58aabdcd3e9c9ca00601e2348dfe1b3946fac7219817fcbea
font_01_sfnt_off000104ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AD 11340 bytes
SHA-256: 2a734d3b7390c4f5b10925f85600f567f9f9382969353c00d865ac0c0154d6f7
font_02_sfnt_off00011f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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