Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8fe63d508ca02df…

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 05:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ca4315f21640ea3a6d06254f8f7ddff2 SHA-1: 6a00f5100b4c8175c821b68445284a264afccf34 SHA-256: b8fe63d508ca02dfbc9bc5b72eb86adfe3798e18ee0bee67b4bc10debc5647f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, which are likely used to host or redirect to malicious content. The presence of a 'download button' heuristic further suggests a lure to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • 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://laborke.ru/uplcv?utm_term=composition+writing+worksheets+for+grade+1 PDF link annotation
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/72802426661.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071215dc8eac---powitab.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/c266mkn5qh3kihe1i5ja5fkhea/38795168729.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/zadomutezex.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/78792027087.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096bcc7c304d---sujomofelifupakes.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607017cdd7d2e---wapigepurajubakufopinafo.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/39566792836.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/pg47f9jgcrbpqcpo1cop3766n5/41913570919.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bfbc977e0---bezuvetaxexopoza.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac64bc83d00---vumesunesujadenoruvofo.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/88024937877.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5faa254af6c215851ac4a630ba64dcf3/lulobobomeveviwoxubitelal.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/596e46923c315fa513e29ee2fef1f204/kitix.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/b18bec0d188891aa8c1ff01c7cf27451/sivefodidibusujip.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/ravoxabejonivatol.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/43990947851.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988fa6d3cbf---mafewizunosesupox.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/79221269063.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/dafamatevojofibifaze.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/wexutijubotibutuxabi.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/miferexobemewefivizudeve.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a12d55a7---8777903125.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607578b676b59---37667951774.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fc06574ba---53700712225.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210805_F01D29A4D40DBE4A.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_off0000dcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC3 11160 bytes
SHA-256: 3d864f71580e7620163611303a95add80803ac084993bf6e28a9d3498e3f20d4
font_01_sfnt_off0000f69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69A 17480 bytes
SHA-256: 76e3e4d5d7ffec3e39bf1d84fa2c3a77472fb1ebff23c7f00af5bccb7f5cb7fa
font_02_sfnt_off000123f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.