Malicious PDF — malware analysis report

Static analysis result for SHA-256 e607d5218edb5a7a…

MALICIOUS

PDF

73.8 KB Created: 2021-09-02 03:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3c83d3ea1677a49d29c25ac0623359d SHA-1: 6fad5bb901bffb37bc8e66bcf0f9a95edec4b820 SHA-256: e607d5218edb5a7a357dd7b1abefa682ebe528d845f3a94e5988ad41768e7d36
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the presence of numerous external URIs, some pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://prestizhstroycompany.ru/SITE/files/editor/file/sojuxozivubetokadajora.pdf In PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/32663636149.pdfIn PDF document text
    • http://househouse.it/userfiles/files/46951695991.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db6ede9df9e---bezivewoxuvowutizodera.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/jupesuwesegutarozipar.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/6b8a7075dfe12992276e4cf3198ba88e/24415117136.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16094cbdc072d1---26758791637.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/91266091274.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/5lspf5pvsnoolse7sat1lgdb02/wavojudu.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/wadibaras.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8bef8b7ed---vemusaxavifadamaxaxu.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/47e1ls2ngr2o5ao069gtuthfta/1560552678.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de3559d6a2e---70031492696.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/xogamibeseviro.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/94616851950.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b99646d65---bodemaviruwaxulali.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/galit.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/18405613000.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/ruxozowole.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/12964220236.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/wovubakajerizigoti.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210620_6d7aa.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca02e92fe3a---mositaxivilesiwab.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b8545f624---29354305654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=love+can+wait+quotesPDF 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_off0000c188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC188 10432 bytes
SHA-256: b5ac981561638326422f17fa54ed257b527dca32f7df9b7e634d4219ec1fb271
font_01_sfnt_off0000d964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD964 15476 bytes
SHA-256: cf68098bce152935bd6264fc20b40b29ebbbb67b05c5b388a3b70ddfd71068dc
font_02_sfnt_off00010093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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