Malicious PDF — malware analysis report

Static analysis result for SHA-256 4148cece293e73a4…

MALICIOUS

PDF

84.5 KB Created: 2021-09-09 01:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 317bf32c38c6506c5eef67749b3636ec SHA-1: 79649a813409c3d88a9ac5c8a71d9e611f04716f SHA-256: 4148cece293e73a4905279b7f01b81ecbba49ec33a2c8c9c58cccb1f5b9658f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are associated with link farms or compromised content management systems. The presence of these links suggests an attempt to redirect users to malicious sites, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=top+10+best+phone+processor PDF link annotation
    • http://tatagz.com/uploadfile/files/xebamawevugi.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/dopibupugunuzo.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/24035129888.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/99127929152.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/jimibukifevadinokapi.pdfIn PDF document text
    • https://sapporopools.com/contents/files/rusaz.pdfIn PDF document text
    • http://naviway.su/upload/files/20466339984.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/dejevaguninelixiwa.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/zomalavijepini.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/47754414025.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/gijedabegebilinonoxaz.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/17826698004.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/10876115356.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/43607638449.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa9124cfe---67836284177.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/03ab66f82faccc49e61155161b3c0711/60119287763.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/sokanakozugowaletulega.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/wibamipufejawoni.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/posurekefixadoxupuwizogik.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/81844674111.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/jusinedo.pdfIn PDF document text
    • http://telektrans.hu/editor_up/ruzidivojiwokakol.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613820f9daa3e---simalizuwasevokel.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/54186907341.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/60151220111.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/tenumigexuxamefiduvidog.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_off0000e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 18000 bytes
SHA-256: f74c6d4136dec4d9247c1ff4ffd36fac345e5e9eb7874f52da54a9e4d5d40da1
font_01_sfnt_off000114ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AD 10448 bytes
SHA-256: 24577dd1b556a672543008da147f849f2a243d6e1ebb1b87027830804ef0b9db
font_02_sfnt_off00012c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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