Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a592a3a14ff177…

MALICIOUS

PDF

98.9 KB Created: 2021-07-22 22:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f936457208de39051734f399b4a04de7 SHA-1: afd3d5b5b82ef5c1a5c720d6aa73bc769a5d2fd6 SHA-256: b6a592a3a14ff177f7ff23879d2713b9197bb197caf6c20901f202153e2bdef6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload directories, indicating it functions as a link farm to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8553ab7f6176d4c9d7602380a7ee5ccd/gowexobonirigomuwewa.pdf In PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec6dd92809---48256687338.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/5p5ctsetuou6m4uf9rhuptrpsg/81274814594.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/67476862695.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16203199995531.pdfIn PDF document text
    • https://kopari.hu/files/file/87493752531.pdfIn PDF document text
    • http://staropolski.net/Upload/file/14040286207.pdfIn PDF document text
    • https://digireg.cn/upload/34691528408.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/wubasezivipini.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf83f8a07b---sewixafarepabolefejif.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/bvca3isah7phdudla6hdam4kp0/60403458080.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b839d466ec8---41441674808.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/fuzarojutatirifitetorekaj.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/mijigikulodiruma.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/41100941798.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0232b786e---wigipagowupubaxi.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2206bb9e3c---dosakozenoli.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/2131a9106616035b672f9d36e046f662/titewovumifavowolukidole.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/13431125039.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/c51f826b0519bdfea24c6e873c34dbab/rufakinubojogusakelo.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0f5349467187ca27ce2d6e7dc10fc099/gilibimawirefodijuvese.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa31b9936e3---mukodapudewidalu.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/f5ece851cb00c5b0d915ac9bf3284bab/milamebomizaloweri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=deaf+and+dump+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 3804 bytes
SHA-256: c82e7e0237721955394cd661064bd9ace58bb89c4fa78bbd95e81e9b6fd7de2e
font_01_sfnt_off0000fcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 16892 bytes
SHA-256: e1e10da56112166e8f19881e7b26ffded41f2e14967fa909e63c794139ae12fb
font_02_sfnt_off0001156f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156F 21736 bytes
SHA-256: b6e4afe000528ab114ee160f660c85dd41b989f97cdd9dd55ae8e47b6dfdeccb
font_03_sfnt_off00014bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB7 10408 bytes
SHA-256: f0424290b7c5246fb3ada3e474679e19cc4e6ffc6ef11ae67cb4a9cf96b1d4ae
font_04_sfnt_off000162f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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