Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd355fee50847eae…

MALICIOUS

PDF

81.2 KB Created: 2021-06-25 17:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3f0f5a836d8abb53d7bdf064baf18622 SHA-1: ac96b7fc8430d914eb8b4a4cd1abf96a7019a3cd SHA-256: bd355fee50847eae0ed94b05d2c7c80a31fbf5db97a0cb4b0a310bfd82192e1a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links strongly indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b0f2de3eb58378b1e03d6c35706775cb/segati.pdf In PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/68c7089c56b99deb4d8bd793748a0bcb/fijakej.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/9424270820.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1620864858.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086ff34da9b6---kubalofetokivi.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47755b58cf---85013553670.pdfIn PDF document text
    • http://www.emailposte.com/pictures/94988160079.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd0398d30---89316776179.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/be195ed4aaa6e541bf1f1863eb1f2b1c/29625129466.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aba7957e510---lobarizametumuzaravizape.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/xozusudobezijexofewemipud.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/tulidenegimodumi.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865fba6a56a---zarugapovagoxodosigeku.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/a7ffd991cb79a67fb72d5a786985063c/97766720979.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2e45d6578---rujanegakivufafejakegiji.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210430010151142.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076657a58f68---93045685731.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfb59f1497---6968806640.pdfIn PDF document text
    • https://aedwea.com/upload/foto/mepawogoxenema.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/xumebajobuxavofixigigula.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dd10ea440---safolufurixeluguv.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee7498b2e---71813094097.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40f0bdd7f4---71365469295.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b246824e978---59763663622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=77+x+70+cm+in+inchesPDF 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_off0000e3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 14916 bytes
SHA-256: a431303f6da2621f3327422a488ac94b6eb8afe3a05ed5da0cfea7ff5e9a1f41
font_01_sfnt_off0001095e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12175 10148 bytes
SHA-256: 288d1f2aa1ea1f925409eca6ceda79bc198df7095304c2a7b136c5550868b2a7