Malicious PDF — malware analysis report

Static analysis result for SHA-256 421f9490cddc06f9…

MALICIOUS

PDF

93.3 KB Created: 2021-06-28 06:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e609a79a14d91b167df1277a480af850 SHA-1: 33b77499b26e3db58c6fdf474e415d70654594fd SHA-256: 421f9490cddc06f9565e0d3556a538ae1e412af4f4b92932bed64f3bd5b9e107
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://garglob.ru/uplcv?utm_term=pretty+woman+full+length+movie+online
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fccf4871ba---99153059653.pdf
    • https://myphi.biz/nbloom/fckuploads/file/miditaregatuxawerujiv.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2ea953340---rizolopozarodol.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/478b214c6c3044806d2aad419f2aa96f/98400561513.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094454cef4c2---wajovopidekawasivivotatof.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/62d099e34cd0248618c21e883498b337/98226838343.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b49aea15d1---dodudadarujapemabiw.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b985597e45c---xopipo.pdf
    • http://mbcasc.net/imgs/file/kodirejoxakup.pdf
    • http://millecolori.it/images/file/ladorimeboxuvaposiwotu.pdf
    • https://pass-eco-energies.com/ckfinder/userfiles/files/79203901073.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073631e03f01---sojavefukajawenegazetibis.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2f8d74575---fevobomaka.pdf
    • http://indovinandoilmondo.it/themes/userfiles//files/96612122157.pdf
    • http://reicar.dk/userfiles/file/fizufido.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/2f6c0fd579e64accec28634c1c2e1c07/xofemetimitove.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bee33030c---29546830038.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/epm1c6bctiauje84ujha2rq4c8/wakegitak.pdf
    • https://mmszke.hu/files/file/saninege.pdf
    • http://lucavolpicella.it/userfiles/files/88798478621.pdf
    • http://cnp-inc.com/ckupload/files/41082243884.pdf
    • http://szzxwx.com/Upload/Upload/file/202161812806895.pdf
    • http://fitviewer.de/files/file/gegakizesugajixa.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ab71ca836---radasemovin.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/eb8p5auu0231avjatkafof0o9o/pibipumulapagerodolew.pdf
    • https://advantagelic.com/singhania/downloads/file/27032435213.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_off00010904.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10904 16792 bytes
font_01_sfnt_off0001211b.bin
bf99fdb34afd7bb5d5bc4e04de7ea176c25848e940d78dbd1452a725fdf7368c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1211B 10860 bytes
font_02_sfnt_off00013a0d.bin
7042b55e6e1b208007d312c46858386fa45a9d259abbe957ff1af5db2d8da433
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0D 17480 bytes