Malicious PDF — malware analysis report

Static analysis result for SHA-256 69750dc0c4aa80fc…

MALICIOUS

PDF

78.5 KB Created: 2021-09-02 10:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb5ebec01bbb030fd3de4769e75bcb19 SHA-1: 5e1c82bc4f0a2cca0489d024dd0883f8c286cb77 SHA-256: 69750dc0c4aa80fc154ca812ceb1f4f17600ed0abb4e111d7f83a58680c51b9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a link farm pointing to multiple compromised WordPress sites. These sites host other PDF files, suggesting a multi-stage distribution or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/3ebbf078d3a05584f5707a5f6e9ad2d6/45580839935.pdf In PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984c436a0cd---bitidis.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a08b60a276---74083678206.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/jqctn7njfkd8kn57d1n10ua1a2/lebavinuvorulevotiwiredi.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a20d1eb0192---89645451025.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/susivesufode.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210626_222259.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbb62ac65e---bapisuvegomatirivavap.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/4914006011.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/6470183476.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/f292ad181d01453f6fa1f47940f5f4c2/bezarogiv.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/difajarikivatenuduvuj.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caa6f6ed450---vesaguw.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2dm98h1dr3iscg7fs8q9gqvfn6/dofaligavikibimudag.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dac8d6e1b---potixerevudodijenek.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607384ff90629---63362292237.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/25d326f3f0a120d57e71a1349f5599eb/zenas.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/veposo.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16070c8e84e364---45800119376.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210708031519.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ngpgh7qn2s6e57vkttih8k9e10/48206997417.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/figaselawazusirufa.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1aa169b2b6db685b9f989b91be9ab7e2/81195198391.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/441e36cf5468fe9562bcfeced41abb5a/79849311428.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/13185019552.pdfIn PDF document text
    • https://go2germany.ru/files/file/wagegakokamerar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=helicopter+man+pounds+billionaire+dinosaurPDF 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_off0000c8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A2 10908 bytes
SHA-256: 1119e4b86e17547601581f401c7109a56b06a7c07c3396bc260d6536bbd5ffda
font_01_sfnt_off0000e18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18D 18116 bytes
SHA-256: ac5f86602d54b154c8f303d0ab729c00b1beb56c61965285232c7569326ec328
font_02_sfnt_off000110bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1