Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b49d82ebb67dcd…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 00:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: db246139264af6aefd8bbeed49208754 SHA-1: 5de269dbfc4d9bfee358c188b6dda8e67605360b SHA-256: b7b49d82ebb67dcdb0d06243a475945ddab6de20593ebd7dfe82a67ef8e5860b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary attack pattern involves luring users through these links, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://shoppingplanet.ro/ckfinder/userfiles/files/bojarajipenirod.pdf In PDF document text
    • http://bidwoodmachine.com/d/files/76817179073.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/94723958700.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/70407334913.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414622f0653---56301174506.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/baponugevetatapotogit.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/37621778860.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/vonujoko.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/lavekaj.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/rimadawoxeri.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/nutazoginofufevose.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/19086986536.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/fizemezaniwovawedudegu.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/772d858f122cecc2d4f59c282bb1312e/mifaxabimowimomewu.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/50318429806.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/26554573357.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/30232746163.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/vn9fi1f4c7tfddud9pqju7cri4/85096477749.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/75133978740.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/3852005389.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/22675489074.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/26235030073.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/tovamiwewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+you+screenshot+on+a+galaxy+note+8PDF 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_off0000d75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF74 11160 bytes
SHA-256: 2bc4dc76965f5c926a0e8aeadec9579697e433cc5059ba4a1b16b1b35523a119
font_02_sfnt_off00010960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 17804 bytes
SHA-256: b45bd94cbe9d983bc627683577fbd53943624479c09e36607050e3b35de1d292

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