Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11445acfc4f0423…

MALICIOUS

PDF

96.5 KB Created: 2021-07-14 03:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f1719c62305bfd5ff9aa4703fb485f56 SHA-1: cbc4b385f05909668ff1f862c6daf0800c52c7e9 SHA-256: f11445acfc4f042354f91205f04066e4e720ab16ccfaf78faa68255edfe5c09e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. It contains numerous links to compromised WordPress sites and other domains, suggesting it is part of a link farm designed to host malicious content. The presence of a visual download button further supports the lure for users to interact with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://wastran.ru/uplcv?utm_term=on+a+typical+microscope+there+is+a+rotating+part+containing+three+different+objective+lenses PDF link annotation
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608061a68ea1f---vakiwifalaniledudoren.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ab2605806---tepafebikiwiraxu.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/vizom.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/96112665871.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/5abcu1h4mal6tj5qundhbuem3v/95277844365.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/dipemodesosifemem.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf285eb571---milisuv.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/olr5d2pjsf9ufvlk14p2g39j47/96545481900.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd59d69257a---69051846093.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17cebe9611---xomed.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc42ad9baa---36820442012.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/6894060293.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/ripogisaniradinuno.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/daxita.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a26cdd24d24---42003248423.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/revev.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160989a5684778---mujeposusuxeraxo.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/93993921989.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/29696431853.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/90689776045.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/xaxiwaredidapoxotavisasej.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/fevolowojutudilexa.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8vmp1iafc7aqc0hnjtg5kaf8g3/bibekinidivepedomi.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/92441323325.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/tatosiwumelij.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/14794159466.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_off000110de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DE 18004 bytes
SHA-256: d562fbd208ac2c46cba6819338920d5f23f6dc5f1cb73cf680259f49c51eb5e8
font_01_sfnt_off0001407b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407B 11540 bytes
SHA-256: f1b2eb2aa40b14b7b9144866874472b3a39798eec9e7975899d2cefcd976d73a
font_02_sfnt_off00015b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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