Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eb8a76eac9ccac0…

MALICIOUS

PDF

89.2 KB Created: 2021-07-02 23:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7a16ccfb564e17fd216b8b3cfdddc6c7 SHA-1: aa645b7578ba0c1e7962fdb21d170e162facd7e5 SHA-256: 6eb8a76eac9ccac01a9756a7bf7a95b1e5aa89b98f3d27a367c518225c53187b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a phishing lure, as indicated by the 'SE_CLIPBOARD_COMMAND_LURE' heuristic. The document's content, though heavily obfuscated, likely instructs the user to interact with the command line. The presence of numerous URLs pointing to PDF files hosted on various domains suggests a link farm designed to distribute malicious content or redirect users to phishing sites. The ClamAV detection further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16092a57622ac0---70351849074.pdf In PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607f27e3303d6---23532216568.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/b38fdc161d809053baca07c12053e54c/80147304250.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/rirududifezikobuxalaz.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c65d1011e6---dutabapijozenor.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/a4d96efcfa9512454e2f6683100534b8/88714140334.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/leduwabin.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/8745291260a06df3a876c.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078557fac6a8---97639910944.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/sosoma.pdfIn PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/10543364608.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/qj03529gg4864i3v641tlroao0/betikitategugutaxuretipi.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607026a07725d---97343706896.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608925a61ed0e---gipoxajixoxa.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5a06250545bbb1d7b37f42d4e6cebc2e/kepoxesomeban.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8b365622a---tujadabo.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/36554173923.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080beee6dce7---kuvurakulegiporulixevu.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/96446587706.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/36475723308.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dac702b446---68667661756.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/86f2cd23c2f8b358b8e90fbb86401ae5/52129647446.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/xebikitaluvobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=british+titles+of+nobilityPDF 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_off0000f7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB7 18568 bytes
SHA-256: 2f6ed49cbdbd0bc35804065117aa424fd76ba11df039b907163d6af7678a14cb
font_02_sfnt_off00013fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD4 10456 bytes
SHA-256: 3ee0adc6474db98ed8055fee02db00653e33bac880aed44d3a847f44444fcf40

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