Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb588d64bdea89f…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 14:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d2c29520b5b682d219388bb3c5521ae6 SHA-1: e577716c56ce39fadfb9fa00c4b89bd210016196 SHA-256: 7cb588d64bdea89fccd5d66a560131b72171b9dde84d5daef16ee4b719e8ddbd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or trojan delivery mechanism. The presence of a link farm on compromised CMS uploads indicates an attempt to obscure the true destination and leverage potentially trusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143144a350f5---gagukulaturiduditajogumep.pdf In PDF document text
    • http://extintoresorigen.com/images/editor/50304415752.pdfIn PDF document text
    • http://plncse.hu/php_data/file/xoxodikinepivosatug.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/26469306180.pdfIn PDF document text
    • http://alvitraders.com/files/36944018862.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/bakilomeditokuraxotig.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/94856782323.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/pebuxovilasizataxiluke.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/984f2985c775e2dfa1fc8c96c6e4b966/bewajexijigu.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/59992782878.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/21c942a860a931cb5253659a48dbb9ee/puxuwalag.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/46692032778.pdfIn PDF document text
    • http://julianina.dk/upload/file/16175766240.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/94820203029.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613111fcc0844---putufojolomalapinebenoti.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/33694783670.pdfIn PDF document text
    • http://adice-area.com/pictures/files/31840386652.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210906002539.pdfIn PDF document text
    • https://mentormedya.com/files/18740083687.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/18873034503.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4792064f7baeb490cb1253898318a92a/daximib.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/rejobalidowubofux.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210909074926.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/ef021429838c219a184f1d1975c20a6f/nabuzasaxujowulotitulilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=too+many+daves+dr+seuss+pdfPDF link annotation
    • https://mediaget.com/userfiles/files/pobuzofumifebes.pdfIn PDF document text
    • 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_off0000df7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 10668 bytes
SHA-256: 442fe065db3d9b0cacff4798fb3769063875f93282e85fea697f9b37839c9628
font_02_sfnt_off00011004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11004 18716 bytes
SHA-256: 456d195abc7b8de3850c316b82b34476c9f738e3afb144b1503e218052942b9b

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