Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e1fc8486def3c7d…

MALICIOUS

PDF

86.8 KB Created: 2021-08-09 06:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 50226fd694e724e6eec5998b74379d88 SHA-1: eee7d01db2606b9e3f24742fff7ea3fc43de6751 SHA-256: 9e1fc8486def3c7d9e6dc27535e0df58eb7d7ae17868734254bf3e56b51befbb
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pistant.ru/uplcv?utm_term=gameboy+advance+gameshark+codes+pokemon+fire+red PDF link annotation
    • http://medica-eg.com/userfiles/file/99167902521.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/kifesuxobetofaram.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608754d968736---96370669370.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/66414078065.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/52692317192.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/xesuwojinikofibuxukesaxun.pdfIn PDF document text
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/59795220801.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/84498927695.pdfIn PDF document text
    • https://penal-garazh.ru/files/8648673663.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be85e93438---65396825725.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/94940784128.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/6k18ffrapp38h0smm3mf2ons0o/84918182237.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b2387d9e2---nupisigagadetafuvuz.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/zufuvovokomosimevukebuba.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/549da6abfba04ef43f0fb0437f2d067c/penokam.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/soduzupawesiwetuxadig.pdfIn PDF document text
    • https://aedwea.com/upload/foto/lamadisemegovegok.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d2b1679a4---98089469981.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/15ee1600ef9f3b4db9f8ed0b6f0d6162/gebobelovagasubipujuwuzov.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/2189906253.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/99e3e3ea6a75d34fa222ccf25adcffdd/vidonivabup.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/jidekakozawatoruxixi.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_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 11372 bytes
SHA-256: b3f8825ba1a5415c5e9965a7f0d7e91808a5c6e9a069c4be1030a4b50616d7d8
font_01_sfnt_off0001078e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA0 17268 bytes
SHA-256: 4237deea2f804eeab9d0ce07c78d1f729fde8218742b1be2a6deca6c513f8e9e

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