Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10f25272fd1263e…

MALICIOUS

PDF

68.4 KB Created: 2021-09-30 19:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: db495031a47015bdfae2536945231fd7 SHA-1: 273fc90abaa4deb23eb4bb0769492c14e2ad17cf SHA-256: a10f25272fd1263e526cfde4a23eaf974958ce05190336b2b39a0fc0c5a1c5c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous URLs, many of which are part of a link farm hosted on compromised or disposable domains. The embedded JavaScript likely facilitates the redirection to these external sites, which are designed to lure users into downloading further payloads or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=gta+san+andreas+techylist PDF link annotation
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/divenekomugenesu.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/tobetuzufafowidubuxodiwof.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614e64b24b671---xenexadarobekeb.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/54021687261.pdfIn PDF document text
    • http://farashimirooz.com/files/10146263637.pdfIn PDF document text
    • http://taborgospelassembly.com/userfiles/file/89543769193.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/banazami.pdfIn PDF document text
    • https://botroul.be/uploads/33245337518.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/75886201892.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/xulirabagojopug.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/345390a83d3f62ad072c00a494e452e6/20648603025.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/zazevutekumibinofelapop.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-6/20210906135627341419.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/36e0e1fec8d3e0db743ee1af8ecb0a8e/juridiluvinigawozorumu.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/xuwasisijalazudurip.pdfIn PDF document text
    • https://lerivagedesmilleetangs.com/caningest/images/file/31417439516.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/tivara.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/nobededazaba.pdfIn PDF document text
    • https://designclarf.it/file/88223241381.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/zowagubo.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/17975619745.pdfIn PDF document text
    • http://momsystem.ru/public/file/87268252553.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_off0000ada2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA2 15308 bytes
SHA-256: a6cc623813c0c076927e1a60e41f02a5f3581584e34f6b555c5d860571609c68
font_01_sfnt_off0000d4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A0 10500 bytes
SHA-256: 263c73e0e3ecc9982dfd2a099719de883461dc5bf86aafe271e061ae9807d93c
font_02_sfnt_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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