Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4ac4540e0d5c86…

MALICIOUS

PDF

69.4 KB Created: 2021-09-24 21:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be039fff67f4383dbc39ad9b90015151 SHA-1: 3c194ca150a6a46d3f917f2b9dbf72f4a18c0c63 SHA-256: 8e4ac4540e0d5c8624291413adc5ff8dd855dca7f98fdbb975772f5870184700
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like nature. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised Content Management Systems. The primary goal appears to be directing users to potentially malicious or deceptive content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://sunrui-ti.com/d/files/metesaropozukaxubelelirib.pdf In PDF document text
    • https://skl.deindrukdemo.nl/upload/files/zuvazovagav.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/vujisoku.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/napefikinan.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/kuminemesi.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/regupalavegaxe.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/d842b4c953cc7e180a17cb14238009f0/pexegaba.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/jarigugodawusugaw.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/xukikajal.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/63604449113.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021092305084173499.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/16236270979.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/nofesukepomej.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/84740160428.pdfIn PDF document text
    • http://wsm.hk/images/files/ruzofapalixonamotesufix.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/93846334096.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/fepogivaxusolobobu.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/stm1gb1el9g83tg0hvn69blo40/55519494608.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614562ef4c6f7---21793614093.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/f7924b687fb2c2126a91dfcf0ecee165/45980973651.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d205daf12---jupevutezafowi.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/ferilu.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161478a1bda917---lizufimevu.pdfIn PDF document text
    • https://www.pandahelp.vip/app/10In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pokemon+go+movement+hack+iosPDF 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_off0000b0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E5 10692 bytes
SHA-256: 43216a8320c0e36d67a9420af52e3ff2de61f1d480669a60ced63a7681c46046
font_02_sfnt_off0000e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 15128 bytes
SHA-256: 4d6fed5fa581cfb5e7a22067425ea7582996b0e11e266b1cb1ae4b246a162300

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