Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d22bed67e4c155…

MALICIOUS

PDF

73.6 KB Created: 2021-09-04 19:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0c04fe3a6e8005741a48c1aecab863f8 SHA-1: abf212f16f011bf6ceba5884b78153acc38b2ed6 SHA-256: 08d22bed67e4c1553c35c974e629df8d59a8a5fe5d07e5b35ee6091ed5e9b31f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting or compromised WordPress sites, forming a link farm. The embedded JavaScript likely facilitates the redirection to these malicious links, aiming to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://lyzph.com/userfiles/file/Fl202108090241398713.pdf In PDF document text
    • http://barudan.hk/UploadFile/file/20210624190534831.pdfIn PDF document text
    • http://suaups.net/userfiles/file/50534457731.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160855768a22b2---34467126272.pdfIn PDF document text
    • https://aneri12.cz/res/file/7168343348.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/488598136.pdfIn PDF document text
    • https://istanajp2.com/contents//files/6153801308.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/af9628fe6f5b7dd47769659da9c2bcb9/zapodakuse.pdfIn PDF document text
    • https://wildnaturetravel.com/File/71081499082.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/1d9fc9a677ee091aedea6d3786736a91/18302830541.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/55050947600.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/46085651592.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/70853210410.pdfIn PDF document text
    • http://shophouse.info/images/files/sadolufozewodupekalis.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/fadobetarinenafoxowakafu.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///21920763159.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/67951905354.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/80502115674.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/25987f2933d120497838e141265ccb2b/46811277681.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/nejakexixivo.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e482bae402---ganetaxoxalunuzu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ae3fea836.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/lelelusefab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=manual+camera+pro+apk+1.9PDF link annotation
    • 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_off0000ba6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6A 10648 bytes
SHA-256: 465013c683f72359c7a6bf95e655dd233631b5ebb5b56a8c51bf396ae2c422e0
font_01_sfnt_off0000d2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CF 17088 bytes
SHA-256: 6ab720eb9cf4c95f063f8dde97c06265086161859412618f11fb6c72915fe9ba
font_02_sfnt_off0000ff6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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