Malicious PDF — malware analysis report

Static analysis result for SHA-256 6741d47c552bdfdc…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 09:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bf436ef8265e65ca1a90004acd8bdbb0 SHA-1: 83c063ed5d418c7503b7d16812bd3c4c20bfef0c SHA-256: 6741d47c552bdfdc7d519e3709a539746557dcdd43220a9fba2b4146388f8f8a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristics indicate a focus on external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://arndt-fahrschule.de/userfiles/file/xujimolalok.pdf In PDF document text
    • http://meble-tk.pl/userfiles/file/38908766750.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/rojogemoxubusazilub.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357536b63c7---59061919038.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/wufurapivuketunowexidur.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/62172492458.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/wiboku.pdfIn PDF document text
    • http://master-vin.ru/files/file/miluruse.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/pojisox.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/nemas.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/3415765445.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/fajetiradixixogudep.pdfIn PDF document text
    • http://metapolar.hu/tmp/wofepigojuziwobiv.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132ece46c6b2---12469264453.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/55014565739.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/j24oqild3vspj63iabvkaiu26k/43626716119.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/milovupudaxure.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/saronagipufudirale.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/jozufunu.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/gr82fkseb90n9leruvj9ljtbf0/63844321743.pdfIn PDF document text
    • http://fitviewer.biz/files/file/93854294909.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/85693433223.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/13ae23f8658a9c63fb3e1b7f9eeb6bae/kusox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=angry+birds+star+wars+play+storePDF 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_off0000d8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 17580 bytes
SHA-256: b42a86c50a8723f80df1ed4405a89d70e2a3c3a3ffe19132c459c1e2159780c2
font_02_sfnt_off00011e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3E 10888 bytes
SHA-256: 8be0c8c0d9454b7d460f54c5558018ec75038ab154dac552f18d2c2c09b91fea

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