Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b361506f3edf180…

MALICIOUS

PDF

87.5 KB Created: 2021-08-02 21:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0d492b86764b318d7226d041446fda45 SHA-1: 220c49977ca0df1c27b0a9a0981f06ae066c3f94 SHA-256: 4b361506f3edf180d45434965954f8c44def1c6d5439979d8d6fa2f5311d9518
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing campaigns that leverage link farms to distribute malware or lead users to fraudulent sites. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/a98d9b0340bff58823ff6e94aba6968e/65794539617.pdf In PDF document text
    • https://t2sc.me/userfiles/rusupigekifakilas.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210603_33013163344068AD.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf56f98b15c---pagadap.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e453a2b60---17634491325.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc3ff52f8a---25547099124.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16087694a8d595---69650730519.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/29356931700.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/83710c47e488925cc81769def4f5f5af/22120926501.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/75499674866.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b912fd06cc8---92549049602.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a90649161a4---69069509318.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/53453025535.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12d7f9d694---xirubuxitokefof.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/60250581866.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8778592a2---nolumevizemafada.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a26638ebcd9---siwusixemerelizefiparo.pdfIn PDF document text
    • http://tipiland.net/upload/file/butaxuruno.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b0dc216b7---21689316056.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/zalivegidipupawijerux.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/etat2rp0c5avd9f649250vqng7/domeduw.pdfIn PDF document text
    • http://pauseforserenity.com/clients/1/10/1002a5d8b3740fc7390aa1937d1ec3ed/File/2726798521.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/85302962946.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/la5qr303hhjoboelj3jn4alfd5/67014859342.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/1b573d9453af89f492acf9c65d439eca/89516342952.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/56ffr0nnp7hgosa0vok93qd3no/lozifuno.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608839b79ded9---24731199473.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/wezipixaxuzazozolike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=k%C3%BCrt%C3%A7e+mevlidi+%C5%9Ferif+video+indirPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD9 18580 bytes
SHA-256: ec4fe357715606e4882c642a99ab869b7746c194e589ce5c69ced40403d8b09d
font_01_sfnt_off0000ec03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10415 19040 bytes
SHA-256: 0d307cc482b92ed1658ccfd494f76b75d43a41b33b974a73adaa7cd18e6a3cb9
font_03_sfnt_off000133a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A5 10872 bytes
SHA-256: ecaa3f012d1b32a25da52609ac2c444d5f8f0e32c9c00cb98e8125d5aa4a367a