Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0d7162dff0b081…

MALICIOUS

PDF

70.3 KB Created: 2021-09-08 04:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b912a672cae64b580e20227d27ca84ea SHA-1: a4d0aa3252851e602a47a32496651b70f5f884ac SHA-256: 4b0d7162dff0b081c6db6461ffafae1bd0c474448ef1ebfd95439465a77173ae
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF_IMAGE_LURE heuristic indicates it's likely an image-based document designed to trick users into clicking embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://chcial.ru/uplcv?utm_term=mathematical+statistics+ferguson+pdf PDF link annotation
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c1e6b1eeb0154d5793ab6f45fbe5a7f7/fatigijototuxefuvo.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc03d343bcc---fesozugabuzibidefugotaz.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/mepelobofuwanawijenu.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8dj6luuf3pmrtlu0kapt71iul7/jewesisufotinijixafeli.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ef72e416d---bemerotukuxof.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/nojegajakuzalufofa.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/jupofolofasijabuwudarozif.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/2e7de4590be33b6a719d4e0fd7a66b54/zegowerejavim.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/66785140790.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/20260459252.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3433924135f78407518fb2d6fba3f2cf/67440200545.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad814bc7611---35995277009.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/10c40a0989d5733dd8a374a64157242c/58433815564.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/72770994579.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/1638201658.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/24d3e90c013757082c967cb5b177f58d/16293893142.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/ee47fdc416f327a9dc1849f472a66f03/72448324455.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a27890a50e5---30625044736.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/zoviribagipukigide.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/91360118533.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afaffbbf152---govake.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/sopubasibovekijotuk.pdfIn PDF document text
    • https://arerp.kr/data/file///jorakomunutaferalowigivar.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f31c69cfe0b4a4c9dac0ce301d1a9234/42057610644.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_off0000b6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F6 11160 bytes
SHA-256: 1ad94b7a78c64d5028c6a994fafd110b6d7a68ca208c56d82275111229a973ab
font_01_sfnt_off0000d0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A6 14032 bytes
SHA-256: 8eef8c1baa8783a3e9666bd6c6d443377cce86e9239da75bbd3f5252f1cb6fd0
font_02_sfnt_off0000f33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.