Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8ad6ab35707c3a…

MALICIOUS

PDF

75.3 KB Created: 2021-09-17 18:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b525b0872eccb4b266aeb63ceeba58dc SHA-1: d5093e330da91a9306b458d416ed03c894bb7e4b SHA-256: ef8ad6ab35707c3a3d18c7fb4642f518ffcbe3caee2f3b716c05faee96fd15d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Embedded JavaScript streams are present, suggesting potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=professor+marston+and+the+wonder+women+streaming PDF link annotation
    • https://cualuoihoanmy.com/uploads/userfiles/file/45956798037.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/gijov.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/wafomoziju.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ec2bc5ff7---47906747632.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/89165425319.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614256e45f758---55029495295.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/xopubibolow.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/12247035157.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408c4004106---teguso.pdfIn PDF document text
    • http://akademibt.com/resimler/files/wowokigexivekafanaluzut.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4a1391c52---milagobekenu.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210911190832.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6134AA1665563.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/lusagubobibudaf.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/c5caec2cde7e69c56fe2fcf7f9fb5938/jemamogumofu.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/55463374487.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/16963183893.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/81290993607.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613e61ea64f86---misutixu.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/webefiwupafodapasaseko.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///43910121301.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_off0000c0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BE 17692 bytes
SHA-256: 754189341914551eecb4891b39cf85e3ba7dc6d5d3089fa974219141d3b0da6d
font_01_sfnt_off0000eea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA2 10840 bytes
SHA-256: 52f3bb2db5f61ef03e2f673e712a2a031e93ca264dcf305c130e6ccafceee08b
font_02_sfnt_off00010755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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