Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21940f6b1773c88…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 22:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f79562af51af55f73c754133cb2ef39c SHA-1: 93d1f134ce5fff4e607b61508d44b17e9af5d831 SHA-256: e21940f6b1773c882092ecb26127d7d267793e7655dfdaf148fb70560579af90
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the document is part of a link farm, potentially leading to phishing or malware downloads. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://baugeraeteverleih.de/benutzerdateien/novuvubifekepotef.pdf In PDF document text
    • https://md-bud.pl/szklo/photos/file/pekakinegelotem.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/82879656949.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/84833981337.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/pazejavaruruketop.pdfIn PDF document text
    • http://toroisg.com/public/images/files/didepatebifipare.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/nuvedajufabag.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f61bccd3b9b1aa8dd2038cefaf817d4d/fulizotoralodiru.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/b6c611e6e61340489a9205382c2d3b7d/zaziziwumolokulumiteza.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/kamimokarodiruxoneweg.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/53704812622.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/117afa0e2a881866d8ff050b28a9c39c/vepemazegizakod.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/kovagoxoxegab.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/lobijufimumov.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/29181130754.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/24636236382.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/famokuni.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/87499188960.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/womude.pdfIn PDF document text
    • http://skia22.ru/pic/file/74561456842.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/mowigalazetaxizob.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/ziwujikeje.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/raxun.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109180621416369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=como+sincronizar+android+con+macPDF 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_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 19456 bytes
SHA-256: a9c51f1d578618aed8921b45b6221c4969ff6b168807b6b5f3e19d1cb0b409c3
font_02_sfnt_off00012745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12745 10344 bytes
SHA-256: a17bf8422c6be902dae8a462896b5db600d748336f246fac802f45786f09e6f9

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