Malicious PDF — malware analysis report

Static analysis result for SHA-256 2983a5c5c8e9991c…

MALICIOUS

PDF

72.5 KB Created: 2021-09-26 05:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c1dded3b1067b89aca7f91eec8b8b82f SHA-1: a55c8881158a85a10c1114446d7da7dfb6320781 SHA-256: 2983a5c5c8e9991c7a00ebe21e6066cb200318c4924a65d52c135ea59ef9e150
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, many of which are hosted on disposable infrastructure or compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://kxzyjy.com/CKEdit/upload/files/barovajeju.pdf In PDF document text
    • https://zilalcooling.com/other_files/File/redavebexevaxefebinewovas.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/fenoxeverinogexogulo.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/408d01f42cc98ef008c2538102b3fae0/kixolurodoginunijogibe.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210915181020468.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/b645edd9988de1af3dbd532ddfdc0774/nabopugevagogufe.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/11550310151.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/8645647136.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210925_014601.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/linuzofamidifuzoxuti.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/37517542932.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/93nhjbeqj535jvvv52jfe6nq20/77165640083.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210909_193810.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/89059793386.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/62139852348.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/vabadagijazetojomu.pdfIn PDF document text
    • https://qkon.ca/images/file/51444685327.pdfIn PDF document text
    • http://hadt.vn/upload/files/92467793978.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141421eccd50---xaduzetajopu.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/10955470401.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/48731827682.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109221818288317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=android+share+location+with+familyPDF 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_off0000b69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69C 17408 bytes
SHA-256: c5bb976f2ae9031a6ffb2b662a8b7cc677e28c2b06c10c45835e15127fd97e5b
font_01_sfnt_off0000e32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 10920 bytes
SHA-256: b3822a4cd26d18816a51375809c6a2b22d5421fac975981176e390def73275c3