Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9aee8cf04466de8…

MALICIOUS

PDF

96.1 KB Created: 2021-09-04 05:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9eae86dc09ce0df50923f4edcf0320f6 SHA-1: 80b0bc0cd526cf8f406ab5d0a39a743483bb528a SHA-256: e9aee8cf04466de8d38579c94d7fcf9543d52546dfd2ca1da776d8140d63cc38
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users. The heuristic firings indicate a pattern of link farming and the use of compromised CMS upload storage, reinforcing the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pistant.ru/uplcv?utm_term=self+study+program+vw+pdf PDF link annotation
    • http://supair-lux.hu/ckfinder/userfiles/files/37683144848.pdfIn PDF document text
    • http://effekt-film.de/files/file/muruxovulonanivagoba.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/dimozuperarukabunikogeto.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/gamizalemig.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/smjo7v9sbjhd0rc3391b71a2m6/vezoximulabukobukisebak.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609082bfd3d73---wuwetinoxagesizowobuz.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/lananuses.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43545940835.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/radesaj.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/2544517556.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/41383825016.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a28491c7ed8---14889453421.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/64958926848.pdfIn PDF document text
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/88711027739.pdfIn PDF document text
    • http://laduses.nl/image/file/10412789159.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/ff07f3e4ad2596cd1b9265d179c9fef6/penitagosa.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/5a0c052766632495a2028beb23724d4a/xatimatasutov.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/42967285408.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/ac354b8e1953dc967c063061bf9cb919/74139665206.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/80137061131.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210828_103235.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/19683144556.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/jurekokalavi.pdfIn PDF document text
    • http://cokhisah.com/webroot/img/files/molifadenojipomapufoturu.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/58398478311.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_off000110ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AB 18328 bytes
SHA-256: cb5b6b5aae3f6a7504db1621a73789dadb74f3f3a967b38d4c23aac7a268fc64
font_01_sfnt_off0001405d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405D 11084 bytes
SHA-256: c681fb6ce2ef1e1ac8e54ce786db33032477d0fcd3f177847d6fedb13b8b00b5
font_02_sfnt_off00015a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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