Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9a22a6c5e398e9…

MALICIOUS

PDF

98.5 KB Created: 2021-09-01 06:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af76d4c4f68e4676c0070e69df21fc8b SHA-1: 35722bba0ae1866afcae2e637e2ff08b972d1e22 SHA-256: 4c9a22a6c5e398e93da4bd7fe2f283a37baa8686314771413e6a82f20072ea34
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it's part of a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=probation+violation+for+failing+polygraph PDF link annotation
    • https://mgs-on-track.com/app/webroot/userfiles/file/xinukuvoxowinunesemanij.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/r0l7n1a1a5fd2g8guq0r7mk3kk/16464282367.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/lebulufojower.pdfIn PDF document text
    • https://smithsgame.com/calisma2/files/uploads/lelusaridixewukuxurowuzu.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/nominomaluvamesisufo.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe71db124a---didusimaguxufov.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/12850832805.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160766f9f1a2ab---4010326384.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/46365650517.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/51522056259.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb84e7399---pakadufabojuvuvo.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/11170160209.pdfIn PDF document text
    • http://coumert.com/images/file/14069588249.pdfIn PDF document text
    • http://orlickachata.cz/files/files/batatelubaxurito.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160736c0bcd5a3---deremipodaxanago.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/59325127509.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/45566953482.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160af9b732e304---kuvamigapejijepekivapar.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/zevipuxixazovapelidajon.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/65545946814.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f9af42364---33855704784.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/34359467449.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021828051362148.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/lghaj7kcdfnk9jm8ncnu354b72/28378845949.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/18713070017.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_off000118f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F6 10656 bytes
SHA-256: 55e466f900e59419ee984ff375fdabd3f4f44ed11ad692b7b1cd40bdc9c58329
font_01_sfnt_off00013111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13111 19400 bytes
SHA-256: 0c867964425ce19aa49425a2ca86807787e723644d216af90a50bf6880d59641
font_02_sfnt_off000163be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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