Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbe70d3943ed0cc6…

MALICIOUS

PDF

152.1 KB Created: 2021-06-26 03:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a4f519889185b8b04c55e04d3c80efe1 SHA-1: 55f453dca2f45235e3c118af313eea7ad2ab0dcd SHA-256: bbe70d3943ed0cc65511147833e47c680d7282a1fc621572cb34f104e68ec1a3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress uploads and disposable hosting domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=simpsons+pitchforks+gif PDF link annotation
    • http://bioscipublisher.com/files/upfiles/file/82562288280.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a7d3c7788---xofifajupok.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/worutuwuxipabojopulu.pdfIn PDF document text
    • http://jarosi.hu/files/file/tujinisawobuwirikodedik.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/jefimejijamunubebojuj.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97617875de---jivubufisibotajidiganejiz.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e4493ee1---20916286120.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b01bed5034---guxokirikasujuduf.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9addea1a599675a03b88585952fcf80d/matidefezagazusopopuniwet.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/bonagogaselaniramuwolel.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3505861f5---92165788384.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8bcf7d4da---duponinikonujijif.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/tupukigoranukoro.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/578df8301b212259f0b2e291d4e8fe33/46843294672.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/16aj8cgejp5b9unuqbrru47r0p/76338874159.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/zewalupete.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/polenidewivufup.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/62503853671.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d6080cf3c1e---wijarodumogalitarofejura.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b729944417d---zodisogugelozozen.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d164cd4d84---6694967210.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_off0001f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F05C 10756 bytes
SHA-256: e07043323334c8fe17467fa201c93d817b488466162ffd3042d31a826a466235
font_01_sfnt_off000208d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x208D8 18868 bytes
SHA-256: 10f4f44ce97a2e517efec36d9a71b66043e1f56ce055b552251fa9d9c6244500
font_02_sfnt_off00023975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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