Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ee3d1dc9318282…

MALICIOUS

PDF

72.8 KB Created: 2021-09-01 20:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 21272a361ce28fd0beb4d1f266ebef66 SHA-1: 307e40530b6ba9e4127c66d5e8128e426d850324 SHA-256: c5ee3d1dc931828222bad7da5111cf089e27fe52c8aa38ef08204493843e817f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of 'utm_term' in one URL suggests a redirection mechanism to lure users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/menoxanutukalup.pdf In PDF document text
    • http://aftckwt.com/uploads/file/40817538060.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/kezududojusef.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/s3bjnfg7p9jq26ihls1tg1og01/73309998960.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/7c0a5017a4ecdd7139cfb009232014c0/11126171710.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/ditiwapiz.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/tanazugaxogesidafexufom.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/6t21f9smt5580h5uavgmad3e13/6603386592.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54619013b---junukipaguzadinibojax.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/054d991fa27a1ad336afeb968300193a/darobimaleviwovej.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/10882609321.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9cbb24a66---dimudidib.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/34976637507.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c429a0de3b9---71966530350.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/20261069261.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1a6b3cf04---95360451199.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/lonukuvozekelo.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/fijixesukamuxasabetowed.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/14759099822.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/1f07e59657073926873f93e234793dfa/patevizulovadupog.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/0fda18c65d81963ec7ec3021c5f47c88/21253171606.pdfIn PDF document text
    • https://cityface.cz/res/file/2025083502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=music+theory+grade+1+pdf+free+downloadPDF 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_off0000b920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB920 16452 bytes
SHA-256: 69e25402d190ccef8c1103510e776b86fc9e98bcc06597be0036faccd86bee51
font_01_sfnt_off0000e343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 11244 bytes
SHA-256: 170f2bf0eb51f48ce84aafb26059c93b6b6f92e0b1a359f4ac82e85a705247bf
font_02_sfnt_off0000fd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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