Malicious PDF — malware analysis report

Static analysis result for SHA-256 650138b3a53a1619…

MALICIOUS

PDF

80.9 KB Created: 2021-08-19 02:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 52f5c9be1bcfabd01522f96a91294d33 SHA-1: 2f9ee3dfba7864289825454b0a4f2213e47db3c7 SHA-256: 650138b3a53a161906d64e34029525492846967e7de6c29cd7f8ccb0a89a1d41
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=9.s%C4%B1n%C4%B1f+palme+biyoloji+soru+bankas%C4%B1+pdf+indir PDF link annotation
    • http://longbienco.com/js/ckfinder/userfiles/files/jogolonuf.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/11414437253.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210612_F0814543577469A8.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942caa09d05---lelinatuxeziseladisaforo.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/42320261040.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bd8e31503---zitisosi.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b780ccde179---ganasididulubuvixitan.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d794de536---mixik.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nibuva.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/90421429488.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb5fe356d5---defasav.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/ridedilunul.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/467055cb2fb88f17ed3dc227a3234256/88209984772.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/87482372923.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/27052547358.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/54501767287.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/97458828973.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/10907473115.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/dolumoduzasu.pdfIn PDF document text
    • http://cissud.eu/uploads/ck_editor/files/8880002900.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/jor4n3gr3vrok0vcqnm4lgk7qm/lomun.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085cc339552b---79287754284.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/jokilulewugenivimu.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf3b020c97---wokopuvupef.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_off0000d079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD079 11320 bytes
SHA-256: f9cad02d89c06011c9e6bd949159b097d33f565325194b0a00607ba919f816cf
font_01_sfnt_off0000eaad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAD 19144 bytes
SHA-256: 62139d70600ae9217bab9da16975270be642ad9889f7c0a85aa6d41da2c45a11
font_02_sfnt_off000119d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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