Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ecc3c121e5d6dde…

MALICIOUS

PDF

79.7 KB Created: 2021-09-13 00:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c137e7c2d032baeebae70c1b31dbec2d SHA-1: c36c10a10f9795e9e286c49669f608201306552b SHA-256: 5ecc3c121e5d6ddee995b45421f0816954bc2dcc9e3458168fd7bd2be5f34917
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it's part of a phishing or scam campaign. The 'SE_CLICKFIX' heuristic indicates social engineering to prompt the user to execute commands, likely to download and run a secondary payload. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=embed+fonts+in+word PDF link annotation
    • http://hardiebase.com/uploads/assets/filefile/lubatafuwumezolapib.pdfIn PDF document text
    • https://nobelboya.com/userfiles/file/41324403844.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/10817758505.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/659732075.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/sexit.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/55704075487.pdfIn PDF document text
    • http://tzsunup.com/upload/90781525427.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/43bc406b102b5930089858731433c7cb/37833437428.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/69922915228.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/gitezopo.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/3df6038701eb765d2b2974bf01700ddd/96799912162.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/nesuvegaragonida.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/33963663278.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/9239339405.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/madaxaxubor.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/0482b1150e792af08aacba18ccdf2448/18121663055.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/78151708213.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/38397371520.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/vijatiguzabimoritufuka.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zamire.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/sudikodugeduvinatomuzepez.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f840663dc---lufopasadedusaduwejim.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_off0000d3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FA 17744 bytes
SHA-256: 7f9ab36b88d63c95d2035b153e2cee64f2a6aea46c3a911c7c4fb0f682358c6d
font_01_sfnt_off000101b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B4 10516 bytes
SHA-256: cf2075de6b598c5226c32349d9e97f5967c97d81016294007dac1fbfca020458
font_02_sfnt_off000119ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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