Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4d41afac7cd494…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 22:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 84c50d118bcc10653c004e5a2dd455a3 SHA-1: fc9476fa4e120f27dd47b19884afd9e26268ccdb SHA-256: ea4d41afac7cd494d831b4a612f20b73274f479b82c23d1d53ac70446b7c5fdb
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing and trojan threat. The 'SE_CLICKFIX' heuristic suggests social engineering tactics, instructing users to execute commands, which is a common method to bypass macro restrictions. Embedded JavaScript streams and external URIs pointing to potentially compromised sites further support the malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=urdu+font+download+for+android+mobile PDF link annotation
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613054603f7df---wosaguxobujuvi.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/kaxadigedidedizokix.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109042136217358.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/59059567724.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/62502838838.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/4201642370.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/14833869960.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/56651236180.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/57454963610.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/rojaboka.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210902060846_127332.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/kusakagemumo.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae4e5866e---lupadof.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/samipimikojad.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161444b70015f7---30991469332.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/22804527034.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/13615463600.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/9904345661.pdfIn PDF document text
    • https://berettyobne.hu/userfiles/file/89823239064.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/7380442570.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405d0a8dc08---74739889144.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/latabosatefix.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/94764565425.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/72799966466.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_off0000e501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE501 10680 bytes
SHA-256: 50b0216902b10f95e1840edc95bf1c76fc77445d3c2cce496765b7e773ae1690
font_01_sfnt_off0000fd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001158d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158D 18256 bytes
SHA-256: e71f5a31d246f9976b559c363d466a96d55b1d623a6b546d2c316f78efd69bae

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