Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4ebde077b6869f…

MALICIOUS

PDF

83.7 KB Created: 2021-09-22 14:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5a6500136c4acb8c6b7c2bb6ee94abb SHA-1: 1d60be90482dcc6256f4d14b0d186260e5b3bba3 SHA-256: 9e4ebde077b6869f5ee00b20f72e0c3d37ead984eb2dece8b99144bf03249c5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable infrastructure. The embedded URLs are designed to deceive users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://uklearningnetwork.com/userfiles/file/zazosonopazuzibaf.pdf
    • http://kinel-hunter.ru/upfiles/file/vonagodesevib.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408c9e75540---fuxosufidug.pdf
    • http://fitviewer.info/files/file/68668177689.pdf
    • https://lazeo.nl/userfiles/file/22810095274.pdf
    • http://gleb777.com/fck_upload/file/lifogex.pdf
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/sejivumiv.pdf
    • https://vanphongphamhienluong.com/upload/files/lakitu.pdf
    • http://daiichilogistics.com/uploads/news_file/javomatirepeviwil.pdf
    • http://zatoodesign.com/userfiles/files/watanapesavuvejil.pdf
    • http://chafewyuok.handysociality.com/upload/files/zitinazatedabuxodu.pdf
    • https://creativitagh.com/pevron/www/img/file/jiwuvejodinuduzevixakagop.pdf
    • https://abouelhoulgroup.com/userfiles/files/88675331806.pdf
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/xegomevejofe.pdf
    • http://artospace.com/pics/file/vejotipus.pdf
    • http://abbwingslynnhaven.com/uploads/files/1570948130.pdf
    • https://christianschoch.ch/userfiles/file/paxalimujajadub.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/6b122341762e9018f3df4d4e813e81f9/91826998494.pdf
    • http://vektor-bezpeki.com/userfiles/files/37456737886.pdf
    • https://www.corpeverest.com/ckfinder/userfiles/files/50852451767.pdf
    • https://castel.ro/userfiles/file/dunotot.pdf
    • https://safarekhoob.ir/basefile/safarekhoobir/files/xugisukekodub.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/bc4d03c4fc10abcba587fde2917f6aa2/71653446676.pdf
    • http://autoscuolapezzano.it/userfiles/files/kinizononexunolubijewu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=air+fighter+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e399.bin
b02b8c22d4a755cf318cdfb7e9cb72f6126ef1bf215b1b4500f2bdf4a972fa4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE399 17900 bytes
font_01_sfnt_off000111ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111CE 16792 bytes
font_02_sfnt_off000129e5.bin
d3c7f868d56c665811d3f81efe2fa818feafe06c98f401243177f9126b208323		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129E5 10272 bytes

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