Malicious PDF — malware analysis report

Static analysis result for SHA-256 86adea8bb91708cb…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 23:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bdf52cbfa326709b94043eed2af143c7 SHA-1: 30063297f061175394d1b3a30d5cdba98c135e99 SHA-256: 86adea8bb91708cb1919e87601a2e7ea6becb1df20b9738028b2a1c7271a4fb9
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous URLs, many pointing to PDF files on various hosts, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://infrive.ru/uplcv?utm_term=train+to+busan+2+online+watch PDF link annotation
    • http://fotografieindex.nl/images/uploads/vituzanav.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ca286733a---kivusafomofawezazaguz.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/rozukofija.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/a374645a56bdf66d8830e1886c071ca5/9665575459.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090822380570554.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/suwagaxer.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/44928373654.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/dajewapakogaleletapexep.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/47193532425.pdfIn PDF document text
    • http://www.moyekolodin.com/files/40192011438.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/rirume.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/xokejiduvibitovowipel.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/vubulotewel.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/c995740eaa9994beb2480f23a57bcef8/88065584605.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/sotisenufupefitixax.pdfIn PDF document text
    • https://denimder.org/resimler/files/wavozimunef.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/67863761701.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/tonixixumigowowetiraxa.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/46317087326.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/10058428204.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_off0000d8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 18204 bytes
SHA-256: 667c1b60d169114c6d2ea8f3bd0ca77344412a542cba473236fb17b5733e8465
font_01_sfnt_off000107df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF6 10736 bytes
SHA-256: b2b6b7fb97e922e0cd2c7ff5fca4f132044fdd26708fa5dfb2b25f364c2b53a9