Malicious PDF — malware analysis report

Static analysis result for SHA-256 1359fe61e2b01b00…

MALICIOUS

PDF

88.9 KB Created: 2021-06-25 21:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ee4fdc942ac417f184729671f43611c0 SHA-1: 8e01076b2bc88aa52ea13d61d62f714ce57d754e SHA-256: 1359fe61e2b01b007d1838ebcc6d639e23914d8cf270be2f462c30a4bd1a0ae0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism for malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. ClamAV detection and ML classification confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://medvor.ru/uplcv?utm_term=principles+of+anatomy+and+physiology+pdf+tortora PDF link annotation
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/cdaaf114ae1c9904ee3fff9a97fa25b3/41681496595.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16239193484537.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5db40f228---91421849865.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/fb841c9abd5c18991d59ff81fc27e09b/najutifujinonubat.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/721ac620fdb92519012a8b840677c560/99485703582.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd2109199f---51072966646.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f5719d02---neguzivugow.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/cccd6ada6b0bbbc36929022ee13d7699/69628067881.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/14d9vhos63a65b6enb4vqhndm7/18100857341.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/3fb1a05e6464b1aa5cd15937e5afd813/88166030114.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d17ef08e83---noduvuzuxezagunav.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/tekekajeluni.pdfIn PDF document text
    • http://euro-ex.com/bixebukovupenawe.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/7dsefk66nqppmsff2kkpp1oak7/fagamebapavipipuwex.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/36b71d8a53f6d7ba3aed40ecc9825d6a/bapokodiroxuzeje.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afa876983d1---35657370914.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c7ffd471d4876b8258f96e20ad54eda4/mudujedorevamomelixigegof.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/211b36176a55a17472e6c6fc54a44345/firubibiravo.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/17bcbfeb7cc13160a66ba060fc8204dc/rominodi.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d1fcbf03e---14126539510.pdfIn PDF document text
    • http://megalaserasia.com/upload///58620008030.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f87521a97cc2d0310466fe9b47643d52/16155891076.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/43026286681.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ac190b849---zafofawigojexuzatakedujab.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_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 11184 bytes
SHA-256: a9c4e3f0007886e7996548369e7d31f04a3b8e4227412061bf0318888d86cced
font_01_sfnt_off00010ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B4 19080 bytes
SHA-256: 4fb8e14531d0b1dcdc7bd9bb2f392518907b86b47648554dc707ad24491fc51c

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