Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea58a95ba77bd30…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 02:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 72351ac921a6fb6274c9e5fcf3ac92f3 SHA-1: 45f8bcec8e62f88d17100b489e8f8504de990010 SHA-256: bea58a95ba77bd3065a44fb40ab6ed8a42603e793b86ca1d8aaa5d13a5813050
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are hosted on disposable or compromised domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the redirection to these malicious links, aiming to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ip+camera+search+tool+android PDF link annotation
    • http://garage-ys.info/js/upload/files/weliko.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311f6d98f57---sezavapafupavegixiv.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zonureb.pdfIn PDF document text
    • http://techbis.pl/files/file/xiwajutojonopiruwijotiwum.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/2821943063.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/60464840027.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/rekugesinavamatupu.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/peranafi.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e72fce834---tixatunegodip.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/kosuwujuwizubi.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/18430301563.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/69037063105.pdfIn PDF document text
    • https://salwangurugram.com/files/80060112787.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/todafen.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/baretememelokuz.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/gosipenorufimobogak.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/39818875661377be9e1f69.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/zavazoko.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/50164045456.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/vexekomuvipe.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/93818902435.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/gebewiwovujopuxu.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/52427309928.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/86696085914.pdfIn PDF document text
    • http://guowangcable.com/d/files/vobavuramudikoj.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/lofuxudijesana.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9d10e9d4a---41624763411.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/68028585736.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_off0000d6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 18096 bytes
SHA-256: cccb2c6b26c10d7a6ef7928eabd69a42ffa768a3ea501d148d56feae10eb7b3d
font_01_sfnt_off000105de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DE 10728 bytes
SHA-256: 6e36659c617ad3d993dd1ec04a284924bd0d32d8221ffe171014560bcf792f11
font_02_sfnt_off00011e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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