Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b96a79b9b0665b1…

MALICIOUS

PDF

86.9 KB Created: 2021-07-03 03:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 86f5d760acbddbda78ff4bc4fbf25fdc SHA-1: ca88e32865b119a3c87ca0fe880cb92478b73d6a SHA-256: 0b96a79b9b0665b1924b050ee0ec060b3313d89f6ff967bfc66485dc55e2da98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary lure is a link suggesting a download for 'idm for windows 10 64 bit with patch', indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://laborke.ru/uplcv?utm_term=idm+for+windows+10+64+bit+with+patch PDF link annotation
    • https://yuktogel.com/contents//files/donutopasad.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/6780195593.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/31630762305.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202161805921281.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/nukobivozepisaxi.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098522f91808---pebakekuzoxilemat.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/75870925726.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbb827fbde---vazurosimaro.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/tamuvovivunikokudolazem.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/91745421539.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/ab786f908ea5b44b14bf115333b91843/20029850904.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/82c15c54cbd74bd7ff835db599df3430/58009904771.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/62248683725.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2otu76rdvfkh0m4c9h286ft8l6/sivajolutuxokeg.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607290fa2b2c8---32392415724.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac82a354461---petoduradukazezezefer.pdfIn PDF document text
    • http://absigorta.come/file/68301831507.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/28060349249.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/gabelaxiluposunetewixolab.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/10987025207.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/tenirufupunebifufopabe.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160765e3998ff5---46069301386.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_off0000efdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDF 16928 bytes
SHA-256: 1ce1b328e87516fe301afbcb659dfa4725b5513a6dc6e45f005e627f43b8ad45
font_01_sfnt_off00011c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C17 11304 bytes
SHA-256: 766a51f202eb3b1817cf2abb19a4208b95eef82070e3ae42789ce4f25be5fea2
font_02_sfnt_off00013662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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