Malicious PDF — malware analysis report

Static analysis result for SHA-256 7051dcddc6859e1e…

MALICIOUS

PDF

93.6 KB Created: 2021-09-02 10:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4ecfcf96e32022c6ff46d7648a89d21b SHA-1: 8407506218b4e93fff0a0fc26f326a70a0609b89 SHA-256: 7051dcddc6859e1e3976c7420bf2be0aba54f3920866d946a132ae8749847b20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external resources. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://archism.ru/uplcv?utm_term=one+reason+song PDF link annotation
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/sipuli.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/rusofaru.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f48782aadf---gudiwupidiv.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/duwajuvipa.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/sopurutiro.pdfIn PDF document text
    • http://belloverde.net/emailer/file/45031976856.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610479a126eda---79056364299.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/67231471192.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab13bc4e81---tapuv.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/hj7dtuhibhuf6u3npif2lhg55a/kojarewovoporinaluxaz.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/vexivimomedesozufotokija.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/9671bfb6b23e24b3ff2a1a9e5b71c832/dosajediguwogazatenog.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/46711486333.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/guderojuliwu.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607943814c9db---12553649955.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/56710049079.pdfIn PDF document text
    • http://fairview68.org/clients/c/ca/ca24e3df3ff7fa9b839de6c08aba9959/File/2297616452.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210814053812.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/wefegivabozajiwu.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/56590751846.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/vaxaruwugesowi.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/68577407534.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/sexaxawikuxus.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/668757de7044f8e96749268061e20f20/jejirane.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_off00010940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10940 10072 bytes
SHA-256: a50f07b5ee089cad82e6edb960dbc8c1d8b4671b9996c95a7371cfec3598a3e5
font_01_sfnt_off00011fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCA 18780 bytes
SHA-256: 20f2ae6f99d13973df3c70a7f721091206ab1b3274df290bde58654ff5bff45b
font_02_sfnt_off000150a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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