Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b8a7bada503446…

MALICIOUS

PDF

91.5 KB Created: 2021-09-01 23:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 4af7eb58d84ef13336fbb09446d7ce43 SHA-1: 052c748aa00c2c026b09f5af53165ac47e1631c4 SHA-256: 28b8a7bada5034468c77ca06c707618a96289ec00ba3d39fde07aecd68159a50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/uplcv?utm_term=omohyoid+muscle+knot PDF link annotation
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/88849513292.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/lamave.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35645442975.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16098fc609da01---gukorafapedatapivewowamin.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/48694864667.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a02ad8c606ed623bf70d0e69f2ad38bb/mojupupivubeparopisodej.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/detedokodorizalisasoje.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/74932120598.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/bijanepigi.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5ae19a8b3---moxaxevisepibod.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/b4d5ccf79bf49b42d158e57286221063/suzezusomidite.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077afadb48c0---68024673253.pdfIn PDF document text
    • http://stattus.com/assets/file/12496276397.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/61236613060.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/fcbb14c0863b016360aa7877cd4d24e4/85521560934.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4f5a0d331c1ef8cb13c0707922e346b3/pulopelovezanapaguw.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/40889547753.pdfIn PDF document text
    • https://datajournonepal.org/files/nalotuwunurirorizoreje.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5068cce22---fosutufuzibesove.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072e4e6063a2---25759976896.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/gezukun.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/7444807794.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/db5b6b21f558ffde89fd69b009f5cb6a/48567346777.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608517b2488d5---lopodorejam.pdfIn PDF document text
    • http://btfa.tw/upload/files/26804609429.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_off00010164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10164 10704 bytes
SHA-256: fe809c347db1c19136faa77f591a9399a69986393353c4d7a05ccb0a44e8ccd9
font_01_sfnt_off000119ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CE 17732 bytes
SHA-256: 942fd857e2262df1afe58c4e66a3af0148d58a69080d0f43ec6d204bb8b1b2cf
font_02_sfnt_off000147a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1