Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab6fb737bab343b…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 04:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8854eee287b349ac0249cc5f92250c34 SHA-1: 4a09cdf4a4069a8e95bfe21c4bb74482ac365188 SHA-256: 9ab6fb737bab343b020b5b563f1565b10548e22672d883edefdaac7a16b27195
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=toothpaste+type+of+colloid PDF link annotation
    • http://beijingxinzhi.com/userfiles/file/20210513235417_240341905.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f0ccd2528---62629152932.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/walob.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/a5d92c34c3c410a18ee69adfd13f9ac4/15009840235.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/wejugowa.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210522102050.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210815013749.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/jadasowizeguxolowexiwo.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/pafagojudisine.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/93214101334.pdfIn PDF document text
    • http://cpils.com/userfiles/file/34905085983.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/vorev.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/wevasagusalex.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/lojilesemabot.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/17845578297.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/9c4fc7d8b2a7794d36c480400217d5cd/pobovidakegegusuzipe.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/vixajosixixuzibavagudorin.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/79016115970.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/41007317692.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/59643862135.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf810acaea---kimonerunabasodelaxa.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/38708549637.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb1a693de1---53125952503.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607dab9884b63---kutek.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_off0000e5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FC 17052 bytes
SHA-256: 8298bfdc97abe44abcf2b6054050b1419597050359a94092211ec87c8950c900
font_01_sfnt_off00011227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11227 10592 bytes
SHA-256: 0d4604e63448c866d4946a33975518f1ac1dc359f405377f6c339a220dac764c
font_02_sfnt_off00012a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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