Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1360ef5d8067ce2…

MALICIOUS

PDF

92.4 KB Created: 2021-07-29 16:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 13050155f3cb13bee30103dcaff58a86 SHA-1: bc6c3eee8ea6480fa3fbcad1c79425b8f6936b49 SHA-256: e1360ef5d8067ce213aaff343cd00d649c94c2df7eabd75ba8274bc2d0979e03
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. This suggests the document is designed to redirect users to malicious websites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • 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://coretry.ru/uplcv?utm_term=how+to+run+diagnostics+on+kenmore+washer PDF link annotation
    • http://poltinka.ru/userfiles/file/wikuvuwunex.pdfIn PDF document text
    • https://hoalavender.net/upload/files/pibumebivub.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/93469222967.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160fa08365a312---6909991596.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/webapogaxasorejab.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/sqneo7ad4cumka1she1tfjkfeh/foxabovitikivimuwaka.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acfc50879d1---puxakabonesamezigofefox.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/363789349.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/ketogojividepegufu.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16079ed9f247c1---99085502698.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/geijjhbmrs9p902742mm1q2cd5/bulolimuk.pdfIn PDF document text
    • https://olterus.net/contents//files/bozadi.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///gexexixigi.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5f508bcb---tofumulazufanofega.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/7981644866.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/temesesuzasalefuk.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/78377856462.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/85673937372.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/12985548801.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/37k66lqe4vpv48fn00t5qc0417/jegolelasofadez.pdfIn PDF document text
    • https://manenshop.com/upload/files/2927712155.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/90843669848.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 11040 bytes
SHA-256: 8bd5975f1f9b15c1bb89c010105ae0f5d7818095244d999bd04db43fd7cdf7fd
font_01_sfnt_off0001086f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 16084 bytes
SHA-256: c27fafdda185be2695e99106f22849c7304d1d4eff2202c3575f3979fbde09eb
font_02_sfnt_off00011da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000135b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B6 17388 bytes
SHA-256: 69f1dd33c2b0618aafff2719bff4fb7f4d84027b61d5998c3a48d15c8063e8c7

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