Malicious PDF — malware analysis report

Static analysis result for SHA-256 145911cef7d01c45…

MALICIOUS

PDF

74.2 KB Created: 2021-09-13 14:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0020f09d270e5b1216f62859f8565992 SHA-1: 52c0ccbc6c4ce102155cb916f3c90860c6bd5dce SHA-256: 145911cef7d01c45e1c9904506fc1859d7132f95e072d4be28df0c6d3b9e4814
196 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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
  • 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://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/zafinegeruwapafij.pdf In PDF document text
    • http://antoniolescio.net/userfiles/files/28533337658.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/78531753301.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/nekewebuvonavexobusofa.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/dumitira.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/jekolobekufavefor.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/2db311e1b79dad10810029fcb99bce75/3860894698.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kizerajon.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/wovojasigelulel.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/wiwezisizodekojolefaguru.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f60c56f1bfc341f9acdf9925074849fa/besatej.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/38416268375.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/67141928622.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/38062904406.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130afceb1190---venuzowir.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/20312980667.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/65358221790.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/wofujivoserega.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a72c2627a6d94f95a4611d3867248ee0/repasogaduv.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/7823839972.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-08-04-33-24-27.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/60328998526.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/fomixu.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/80584242433.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/takoporuvelapadixobej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=my+brother+my+love+watch+onlinePDF 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_off0000c0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D1 10728 bytes
SHA-256: f9bc5db92e37d4ad69bdc588e48e4468b12c959f72f4c09e398ff6c5222acecc
font_02_sfnt_off0000f154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF154 16256 bytes
SHA-256: 6de339fe0929e3aa24be4fa5b81fe59c77cb06882c9033dedc8e7d6a0539b846

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