Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4e683a08e4bec0…

MALICIOUS

PDF

71.7 KB Created: 2021-09-03 08:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1720a8dae5b2d5fa7affc8bedca16a5b SHA-1: b6512dbf34fb71d88ba6c7b849166eee844f484d SHA-256: 0b4e683a08e4bec0a63dacc1a1b05063addb4afe4820d17b13281284915f3596
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL findings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/b0d058df0eee48f7401e8ea69e7615bf/23952691356.pdf In PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/6323422241.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161101eebb528c---xaludakamupabakowuzuse.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/55638964730.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/2c5f3eddfcccd5dc0a82d1ca590bbb3d/9231321599.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/7473188290.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fepibuxikoxo.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/15980503686.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/wodegobodifowexex.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/datutarixipidutakuz.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/poximuxixik.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf08bcea1f1---govusatakijuwu.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/wuvidi.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/acsunisj8vm8c2ad4235jjjvq4/72756470007.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/80221670977.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/83313331116.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/47257068131.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/68847459144.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160909f7f0c960---lovawab.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/irrtf4uvorvcehvuljqse61fck/raviwadarorolep.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/puvanik.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/borulikatoluzupowulubinu.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/xepusavibaxulinofed.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/10219605304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=tabla+periodica+actual+2019+pdfPDF 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_off0000b4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCED 16220 bytes
SHA-256: 9923bdeaa158a611f70ff69dd101ef7c2e77cc4a771198b51459355fa5aee371
font_02_sfnt_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 11008 bytes
SHA-256: 728025a0628cadd0dd44e5abdc2868a2500fe059abc6aa119a622cdbae3cabcb