Malicious PDF — malware analysis report

Static analysis result for SHA-256 428f350418647e44…

MALICIOUS

PDF

73.5 KB Created: 2021-09-07 22:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d491b248449dc7ba3533e264d6b12f32 SHA-1: 9280ed0676404bd9f1f07a93946b33c26b2bcbe4 SHA-256: 428f350418647e4461df5a642bc2c894b84cd380909ce74cac028e63a9d925b4
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution lure. It contains numerous links to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are consistent with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://lhsclassof1971.com/clients/74120/File/razetefolizom.pdf In PDF document text
    • http://discus-rus.ru/upl/file/gevagoxunejibujonifofebob.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d677d488ac3---dalipovaxamagi.pdfIn PDF document text
    • http://keiganproductions.com/clients/863431/File/xaxilagam.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074a3c1420af---munukebodozexa.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/b52681d988aae97b1b8bef860d470c6f/3062474935.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/96958146211.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/49157964755.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/nifujuboku.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/17292180774.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/92474431950.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/56163459485.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/wuxem.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c144c6c5c---68128653865.pdfIn PDF document text
    • http://fitviewer.de/files/file/34645122307.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/vedemipujarovifulivubeler.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160fd2f5521cde---1498752567.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c418350bd41---82703052983.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/84652359958.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0306003071---80011380108.pdfIn PDF document text
    • https://ckmandarin.com/uploads/wujoxibiriloji.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/0458c3f734c0384186ad83a559e60ae1/pukoxupudararevaf.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608285c01f966---lomixelofaxipude.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/polodebekuluwazujesufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=solving+quadratic+equations+worksheet+%234PDF 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_off0000bcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF2 16184 bytes
SHA-256: 20b1a0afe34ae0e01ce327a0bd7db90be3a24bfc3b768d7e486f0bb0e1bf579b
font_01_sfnt_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE61 11212 bytes
SHA-256: 675326ca022c6827204b9b89fbbddef9fa7303d8ffee747f6cc1ad4d73cdc363