Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0555303aece98d4…

MALICIOUS

PDF

92.9 KB Created: 2021-10-19 01:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ecf95d62e662a42c812522c3419a83e6 SHA-1: 2374ce379fee0d91fa2ac94fb3aca8f922e11e00 SHA-256: d0555303aece98d4a18f013b3bd342d4a4413311cb47e5886aa52559fbc5962c
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm, with numerous URLs pointing to various domains, some of which appear to be compromised WordPress installations or hosted on disposable infrastructure. The presence of these links suggests the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8102

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 https://allytemp.ru/uplcv?utm_term=what+were+the+effects+of+absolute+monarchs+in+europe PDF link annotation
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20211008092626.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150e9dd774cf---38698945537.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/18368592354.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/mimibaxa.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/52897157569.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/liren.pdfIn PDF document text
    • http://aquatherm-graz.at/files/zozazoxuvesiwotasaluwetix.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/24461673090.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/33336563963.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/1902372028.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/u8af3pk8u7vq7p8lfnf3o17to6/95752012678.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fca20076a8---46328198100.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/20009632208.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/fofipi.pdfIn PDF document text
    • http://vswet.ru/f/pareredidetibufunewu.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/48842042689.pdfIn 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_off00010c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C84 19404 bytes
SHA-256: 9dc259479eb671522a4b43bd34b32e6e763f8c14f719e85c51a519dab9839790
font_01_sfnt_off00013df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF5 11064 bytes
SHA-256: 8323c2e8664b5d2ade4ed916c16c51ba713ea76df227c5028c2995ee0a9297d0
font_02_sfnt_off00015760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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