Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be5fa04bd70e700…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 05:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5402a0149d8e2527b07fbf0a4823c73a SHA-1: d6329e805a822567d4301996e63df561f8e0df39 SHA-256: 3be5fa04bd70e7000e2facdca5796dedba414aa71777a43e07b9bdd940e5cfd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://motorlustor.net/userfiles/file/24365582984.pdf In PDF document text
    • https://saatyapi.com/upload/ckfinder/files/42569185672.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/ponutoxofukamarazodumam.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/sutajimozenomeguxibofigo.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/xawuku.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/76658962390.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/94035815205.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/42866476300.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/guvolope.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16145d3b827fe2---67067041010.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/v6qeq51bfqhk2khdukjt2t0lf9/29952606157.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210908_D3E8A6CBC310E218.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/mujap.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/bidirup.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4ee960249---fuxijibufugoxupufu.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/85512430339.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/30374693508.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/jalukeseropikeli.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/32381437680.pdfIn PDF document text
    • http://theponghop.com/upload/files/23155365548.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138fa0bebe94---54012809102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=t+online+email+app+android+smartphonePDF 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_off0000af3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3D 15384 bytes
SHA-256: e10c80727e48eef5cc11eea5d0862a4c3749a183e62f0aa71e8c1174b2b9de42
font_01_sfnt_off0000d581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED98 10620 bytes
SHA-256: 58f56b7a99922a424938d2d3840c1a55849d109a5bd057df2b06b7c76186ca0a