Malicious PDF — malware analysis report

Static analysis result for SHA-256 b023fd9efe027d32…

MALICIOUS

PDF

84.5 KB Created: 2021-08-16 04:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 392066322250be9f2ac347608463e87a SHA-1: 0b2cbdb6cad72ec8ad03c2e295366d00f21c9d7a SHA-256: b023fd9efe027d329724af3977e6bb0d52f50eb771d9db515e1227196ab76ac9
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.anjhimayath.com/upload/file/jafevez.pdf
    • https://laser123.com/geektic/files/rikibawa.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace07f7d5b6---vilumobikevu.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/28834887558.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d0e37a2af---53035277139.pdf
    • https://pilot-nav.com/ckfinder/userfiles/files/53740199532.pdf
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/79693261358.pdf
    • http://cw-cut.com/uploads/file/luwijavufoko.pdf
    • http://cctsjwhs.com/clients/0/08/08395bc9c2b8280888f0dabd04457394/File/sasalekoxujiran.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/07ce62c794c8e15600dad617680b4b9f/89458864141.pdf
    • http://www.anclupnapoli.it/userfiles/file/91954006053.pdf
    • http://1yunnan.com/ckfinder/userfiles/files/41292652759.pdf
    • http://metabolit-plus.ru/files/file/lodijojagosigox.pdf
    • http://kelvista.lt/images/files/19847465504.pdf
    • https://lescourailleurs.com/upload/editor/file/bazoxezuxiwux.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d5e1fda7c87fa176be0f22eb4df48874/53763457270.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7e5277f003386a8e3aaccb34901818bf/marejos.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/n198m60ccpg5e54nbcdq1jrlus/74922858970.pdf
    • https://ddc-touggourt.dz/ar/files/37716156605.pdf
    • http://mesahighclassof63.com/clients/79820/File/vikerefuxi.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55595794d5---luzavego.pdf
    • http://jshtextile.com/UserFiles/file///dipimoxulujufamidinaje.pdf
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/26785538021.pdf
    • https://ienter.bg/files/98088505082.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cibercultura+de+pierre+levy+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_off0000e48d.bin
203a3329c34498d49902030848e812f79fcb275be5b868afed556a8749e74f1c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE48D 10672 bytes
font_01_sfnt_off0000fcf8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF8 16792 bytes
font_02_sfnt_off0001150a.bin
cb93fd74e5b39a8897679847f1b46501fd217006db1733d997b2e30d04184f6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1150A 18276 bytes