Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b004ef6dddba25f…

MALICIOUS

PDF

83.6 KB Created: 2021-09-13 01:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c26b7cfc0e9e101a06dcd506420c6ad7 SHA-1: 5eb288cf359bd8a9df639930e30811b916792e6a SHA-256: 4b004ef6dddba25f059beef2dc594913351ff03ceb5c9125445d91cfad645dbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the heuristic firings point to a malicious PDF designed to lead users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=mersal+full+movie+tamil+hd+video+download
    • http://shriadinathbank.com/uploads/jagokipodunasejagoga.pdf
    • http://przedszkolenisko.pl/userfiles/file/fukivoji.pdf
    • http://schokobrunnen.com/idata/xudevelidamip.pdf
    • http://vanillasky-ch.com/images/files/rodifol.pdf
    • https://malabarmail.com/ckfinder/userfiles/files/15309202623.pdf
    • https://francois-daulte.com/ckfinder/userfiles/files/jegepebugujabawenajur.pdf
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210906_FBD0A50F7AA022E7.pdf
    • http://es-manzokudou.com/yamituki-n/uploads/files/81491448695.pdf
    • https://arhstroi.by/uploads/files/jukitenimux.pdf
    • http://qkmedica.com/uploads/userfiles/file/55010428932.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f55dd1b4f0---93131730090.pdf
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/palenanevabaki.pdf
    • http://thamcohoaian.com/webroot/img/files/mavofevirigepexiwumunev.pdf
    • http://ceraunavoltapizzeria.it/userfiles/files/35181812125.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e47e6876ee---jufubewojotozotikexur.pdf
    • https://skillmapmagazine.com/ckfinder/userfiles/files/rafuxor.pdf
    • https://travelsafeway.com/userfiles/file/48198721397.pdf
    • https://cleaner.pl/userfiles/file/28030047746.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16132a5d13d396---jomakizisu.pdf
    • http://eamenfaraz.com/cache/fck_files/file/fefupizikune.pdf
    • http://jobsandhi.com/uploaded_files/userfiles/files/mabum.pdf
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/23226253281.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/5713f24e675355da7fe1cfa157fffd11/pekutixikaxezivosebanaw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e158.bin
bdabe2d8d3ae381fcc0c1aabd6c11888a8bbc9d15a44578e6c70a93ae6169b23
pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 17656 bytes
font_01_sfnt_off00010f05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F05 16792 bytes
font_02_sfnt_off0001271c.bin
4a5cfc78e682254bc84f07d565649cbe70975b4d25424c2b01916d8d63ca6310
pdf-font-stream PDF embedded font (sfnt) at offset 0x1271C 10864 bytes