Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54347ad79139169…

MALICIOUS

PDF

73.7 KB Created: 2021-09-06 00:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5f14958ff0a79ee4c5a890455247e075 SHA-1: 15399d04af7676fc004a963a7099c87443ec588f SHA-256: b54347ad791391699bf6fcf1f0e009d4e74886028e379622c6b4b7b1af4d41bc
154 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8901

Heuristics 5

  • 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
  • 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://midlandhigh79.com/clients/866549/File/ziwasebomezanuruxasu.pdf In PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/27422829846.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/sj73n4ss6ntat58d2tvunn1ip1/87666798806.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070364ee2d53---folanomigugepesud.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/penogo.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/loxoduvunafalidivi.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/16612417715.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/4235796794.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/28545316551.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16088c01d443a0---12551406272.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/muwadisafapunobukupi.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16099e70cbae03---joxalejuvafovepowepolu.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/joviwezox.pdfIn PDF document text
    • https://wonkingchina.com/d/files/59166764831.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/zakujepetasasufepenukuja.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/46875628064.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/28489518943.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/18733383779.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608106dc31397---41586210903.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/tuzadorekesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=nissan+navara+d40+2007+manualPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06E 17880 bytes
SHA-256: 3144b91efbff8464cad16c5cc65f1cdfd11554a3c344e3e892879bfd4aee4526
font_01_sfnt_off0000fe90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE90 10572 bytes
SHA-256: d620daeb95fb05150d5cd04d2046037f738c7177498a403fe513004393a6f6fb

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