Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c77159f32999cf…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 00:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: de03e084122187efcd8055c65317b435 SHA-1: 180deebac10ad9bb9c67071b358776ea7e1b080b SHA-256: 94c77159f32999cf2d891bee516c4fcd12a90e83edf1d988561da313148d1c4b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous URLs, many of which point to compromised websites or are part of a link farm. The embedded JavaScript and the nature of the URLs suggest an attempt to redirect the user to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://smidgel.ru/uplcv?utm_term=last+day+on+earth+survival+mod+apk PDF link annotation
    • http://videlec.be/ressource/file/jekipuso.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/nujuvemugisedowofakoko.pdfIn PDF document text
    • http://lj-group.cn/upload/files/ragalugusegeweje.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210902035850_MzY2NTUyNjMyMzA=.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/vabefidibo.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/87898778549.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/bawidigexemo.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/33264523570.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/jamadasevadefosu.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/fuborubabuwenogudum.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ecf3d7f77---61078863349.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/ribadag.pdfIn PDF document text
    • https://rinducm1.com/contents/files/lironakutumowupowebagaxem.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/64149973383.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/a5278c92c334ea828f3d60826d2d1a5a/levafavuzevizodigug.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/4625828286.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e9ce953c61e36cd2a4b8be2843b654a5/zovatu.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210907120559892666.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/27652628911.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109032328302730.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/xugoserar.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/bawurobamunaxuzojesiwo.pdfIn PDF document text
    • http://yuli-china.ru/d/files/86959142786.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/5d68314ec1119afddfc819b617404276/73025886743.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4A 10988 bytes
SHA-256: 41120b5a5163bf87938c671d0493a6b331b590e53ec6918a67c71df9d37b2bdc
font_01_sfnt_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAC 23420 bytes
SHA-256: 30694e666c2a3c2a202892efdbbc21164f199037dd0f1248fbd0f6d25f9ca97a
font_03_sfnt_off00013594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13594 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8

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