Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a040e279711bc49…

MALICIOUS

PDF

78.6 KB Created: 2021-08-19 19:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 718ae4b72a2e5ac1e1e91c7f6ccc244a SHA-1: 54c2c298492b99297863a3266ee2c95931c28873 SHA-256: 1a040e279711bc49dd1ed9bf6a61bdf24bb09e0899450e6f0f61e96fbf709b58
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting users who click these links. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://goref.ru/files/file/rekuxebelumofarugafukegag.pdf In PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/74768076767.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/48083501211.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/82096159339.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/8146794866.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/15019110007.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/xokeluzizatubarazulamofuw.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/93474963211.pdfIn PDF document text
    • https://kristinanamaste.eu/files/wubimizaxewofim.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05e92de8a0---64454976428.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/65650962671.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f2b43d581---58900579253.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/70546065997.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/35818251271.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nocb25cnobisqppbgvce06e4q5/jalutap.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1bc6dc808---12508595316.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a42756c637e---sefopudu.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/75727602549.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/jutanataritotubexufatazaj.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/90089032010.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c1f52175c3116d6bb13ced93305b667b/wozulut.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1610729ad3b862---73158066230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=roms+psp+tudo+para+android+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_off0000caea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEA 18692 bytes
SHA-256: 22fdd8ec121da2740543643324264fc6bf43aa1b15e46fe9c8233080fb1c47ef
font_01_sfnt_off0000f978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001118f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118F 10652 bytes
SHA-256: 32e664c67c53874d4687a6ab97ca73f603f64e316d203e454430217af79af434

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