Malicious PDF — malware analysis report

Static analysis result for SHA-256 0794c7a1895648f8…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 21:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 33830efc34e6ba1bb6e20f3bd59ac7ff SHA-1: 21b742dec2a8a14c1db95797568a77c0385e0f80 SHA-256: 0794c7a1895648f82918e5784fd3041cf9c143838b69f4c99f834e8adcf2481a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to various domains, some of which are hosted on compromised CMS uploads. The presence of multiple embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://dental-forum.ru/userfiles/file/morumaz.pdf In PDF document text
    • http://free-note.kr/files/fckeditor/file/1984293052613668ef263b8.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/lipovidu.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/polexizuneb.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/jafav.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/86424162344.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/jidododumexodamalevutabum.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/59930908211.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/gobixijuzotesewo.pdfIn PDF document text
    • http://briztravel.com/upload/files/dujos.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f2a89cd6d---63728812450.pdfIn PDF document text
    • http://kammed.com/userfiles/file/43296737899.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/muluzisasatuleji.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/wenugorimetadoneb.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d80595866---82743940027.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/fegemikudab.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/057dab07257ea181343df4cf320d1678/35333815293.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f2b6f2752---4661006620.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/83803299986.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210909_052139.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142514a26825---80941956723.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-18/images/files/17215300259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=best+android+to+pc+file+transfer+appPDF 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_off0000d13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13C 17320 bytes
SHA-256: 19a0c44194c3de3ca74a07470c69420606899e321a7201201e5bd0127d5f612c
font_01_sfnt_off0000fe3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3D 10668 bytes
SHA-256: e389eae1a79d7d4fd0aa0569dfd6ef372e6421744625d1b89dbbdbdbc5a1fd15
font_02_sfnt_off000116cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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