Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e58e7526a6d82c…

MALICIOUS

PDF

92.4 KB Created: 2021-08-12 14:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2ea1c14fcd1476dc739468345e9de19d SHA-1: dc7948f0b321bf1007e81678ee8c14b4b80d303e SHA-256: c3e58e7526a6d82c40eef568a2ba171ee82cd69e9593575730e33ee6be3132df
204 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. It uses a fake-CAPTCHA lure and an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nomylo.ru/uplcv?utm_term=the+henry+stickmin+collection+free+download+apkpure PDF link annotation
    • http://dep14kirov.ru/userfiles/file/64311443800.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086003602e63---13967194425.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12c17cf42d---revarisasewesinewo.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/kitalojutojopul.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cdec7df75---61509976105.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/c79f304fac15c0782477277f0e2e97d7/vokumunotezikenanojoju.pdfIn PDF document text
    • http://tara77.com/clients/46590/File/xuluwazuxadonetinonak.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/negokijixotivi.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609231b55e7f9---gutanevidelek.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/nubefuwaxezel.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/t6ri10pfi8ohtp257douro7ck3/74193924233.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/4243611721.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/8da944f4644a38d88e64cb81f42b88c7/juwurirutigokedufujak.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080de31041aa---najigamuvex.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/76993472965.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d89d44d4f15---rapebumakavagogiruw.pdfIn PDF document text
    • https://12tiga.com/contents//files/lenafiw.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/ponunogiliniw.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/33957199097.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/wodadogikuwakokinesivi.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/xedetexipudezatatona.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160daf6c18aaaa---fodaber.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/922f228ab9cca457e679a34215b61cf8/waxiwoxamibifiromipeza.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/nijura.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fdf92ef1---nutune.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_off0001038d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038D 11240 bytes
SHA-256: c41859419e7ec7e18a55f057b066e028dab450dba00a7510c0bfa4c1f67a4458
font_01_sfnt_off00011dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E5 17364 bytes
SHA-256: 2d627b4d2e22cced15e23dce0ebba9f5dcd3f952144d6e3a6cf222cd10d7b1f1

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