Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1162e36679428e…

MALICIOUS

PDF

85.6 KB Created: 2021-08-04 14:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ce73f5fc2dab0ef5938be73202af81b SHA-1: 93cd5908437010bffab11a2a9e72da9053ce03b9 SHA-256: 3c1162e36679428e918f9aa2e689e3196c8b1f11a361e52fc42d3b830e869e89
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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 http://nfraccon.org/userfiles/file/jaduvidisuzej.pdf In PDF document text
    • https://bloomlight.pl/_bloom/file/xemobegijanuvirarava.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16089410d85047---87262437574.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/6d6ecfabb4c453fcf8d46806811726ac/86831051860.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/95155955380.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/nasolarixafutevumox.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/43281428350.pdfIn PDF document text
    • https://kristinanamaste.eu/files/jesisibuxiku.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/27943043210.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/6d5bcec07aa2b2224cbc278ea89ec85f/dejeleka.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/vimusujovem.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/s8oq7rlhesg0efa3112kuc0gq2/kibumovuwajosifesojuwepun.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/4078c8f5d2adfdb355324fc555e5e05d/98184965470.pdfIn PDF document text
    • http://myqself.com/upload/files/gibolajojilozod.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/p6d86j9042sklmjl2jmvq9s6v3/fonofexuvetipepupifapi.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/34034998939.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/gorisajefofifoti.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb71e8003d3---50354561801.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/000a7eb789c7a000e28e216f0d370677/manonam.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/46713825367.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/26546718060.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/58644969539.pdfIn PDF document text
    • https://jagominum.com/contents//files/69190035039.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/be153943d93997a9f4237fa20e4c7d12/85962071848.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c89537cf249---41909899046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+change+your+font+size+on+your+computerPDF link annotation
    • 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_off0000e8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BF 11232 bytes
SHA-256: cac813028c6db6b73049aba032dd7adc56140dff11c3442579276ba1be8030e3
font_01_sfnt_off000102fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FB 17284 bytes
SHA-256: 2fc2c92ff43b987947117525533d430a83452d3a3e36626dea2b2e7b117f21c6
font_02_sfnt_off00013077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1