Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3a509ce3b32eed…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 04:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 95765859628d9c7b9315d3d0099f0152 SHA-1: b883cb3fe38e14a6405ab3923dc628f640b5cea6 SHA-256: bb3a509ce3b32eed50cc7c930adb9470250e41db279e50229a36f68bb3ea200c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDFs hosted on compromised CMS uploads and disposable domains, indicating a link farm designed to lure users into downloading further malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://buddhaart.in/userfiles/file/xubanud.pdf In PDF document text
    • https://smsenerji.com/resimler/files/75666056213.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/493c6rrvbndau3up5scubac7m3/nogavedixuzug.pdfIn PDF document text
    • https://songhong.info/userfiles/file/jilenexofipifode.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad2d1cdb25---firanozesoxejufizor.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/kawetijugir.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/pininalofogejebuwifufuw.pdfIn PDF document text
    • https://luminex.pl/upload/file/gewuluvobuzebotujumano.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/jafisuganituboj.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/95588229859.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145e4dba6717---20593933157.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/23202859792.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/72376765458.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/81425649646.pdfIn PDF document text
    • http://ibb-online.ru/f/file/sepanomo.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/jizamarudelu.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/vazalamogefugovakidadubit.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/sinofupuki.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/55692434369.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9990947650.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/37605530913.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/55300863827.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/sotowofedigenovadiwaru.pdfIn PDF document text
    • http://budka39.ru/files/36595706054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=parking+jam+3d+apkPDF 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_off0000d496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD496 10568 bytes
SHA-256: d2bac491ce43df46464c0cc47038c4ab6ec205a11261d6150e4950b1f4c8e990
font_01_sfnt_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 18536 bytes
SHA-256: ba55119d1705ce4a607807c609dd36160be9aca08c00424bd6da9de635a56f97
font_02_sfnt_off00011cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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