Malicious PDF — malware analysis report

Static analysis result for SHA-256 dadb7bd053e44971…

MALICIOUS

PDF

84.6 KB Created: 2021-08-03 22:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4544a0139017ac92b5ff3829ab89efd1 SHA-1: 172db0627773373bd2326ee4d67e51e5335ad528 SHA-256: dadb7bd053e44971002577aed13bbfb62119268b68ef752467898b848aa16291
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains multiple links pointing to compromised WordPress sites, suggesting it's designed to distribute a secondary payload. The heuristic firings indicate a link farm strategy, likely to obscure the true destination or to leverage SEO poisoning for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7974

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/afd408de006cf097156286b5663a9eea/13480508798.pdf In PDF document text
    • http://acecaalcoy.com/userfiles/file/75346231618.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215138307206.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdc08374ea---febakuzet.pdfIn PDF document text
    • http://grhs1983.com/clients/72571/File/1137555466.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c31095c3d---6109836804.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080bc95ae3bf---93140401157.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/0ad33633e6b5de552ef6b86a251a1752/dinepuxumegujutimuvevej.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/miviv.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d25cf0462---ropekabedemasekosukoxew.pdfIn PDF document text
    • https://businesslife.com/content/file/larobofonola.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fd3475468---27581103706.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1f09c0459---24680953875.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d01ef4c40d---37245431249.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/8bc7385ef8cfa1f201e439ab096d5993/86647003942.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d881115de5---wijoxavufezeboxinuzofeju.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/af1b04e6f3905269279352c50840a197/83570932902.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/58674240797.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/gapimegizeberadirup.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/82de1f929a1c9b97602186b0c42d8032/misapiwumanujuwomimak.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4becb41631---55892504973.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/nexapofag.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/68409399154.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/v9tq4ppvtc93fp7d2slm6in3om/tewezinujede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mac+os+x+10.5+8+games+download+freePDF 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_off0001083a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001204c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204C 18420 bytes
SHA-256: 216618519f3f42e74376f21d6a32d382602df91e52b2c1144ae4d8c7184e6bc5

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