Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce63338a9fd959d…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 12:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6208061539d93a63efc07a787dc07cbf SHA-1: 840e1bd151cfe621c4db4b367f6c39ebea9c7879 SHA-256: 5ce63338a9fd959df5c1315377817fa832980dab349b1f59e10883684dc02b83
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or a trojan downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=dragon+ball+z+unreal+android+download PDF link annotation
    • https://onlinendttraining.net/files/81194371577.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/64451096841.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/13888677742.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/mujisoxemiwomi.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/b2qsc6r517qc1bcsj968uv90dh/lisekakexu.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/qrk6pkhihi4hor1g31bllv4f25/74711615388.pdfIn PDF document text
    • https://unitjaya.com/contents/files/77931977002.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/55e39d117650e3e591753bcf656367be/vodonowipefugojejar.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6d9388dfc---vimave.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/simadetulogelevul.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/542b5771c24dc08ffce0a63cdc49d0f1/51718819454.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/39136147803.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/jolan.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/zitalulod.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/10003810302.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/40446484449.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/74446209747.pdfIn PDF document text
    • http://atomleasing.ru/media/File/bojikavagorobet.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/pipifosok.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/xanabofik.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/pasodikenizawuvafuj.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/34324004384.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/39446235344.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_off0000e6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC5 10544 bytes
SHA-256: f270e6021ede132fb5d9cecf17aa393e495008fb68f65c4210e1089fe8ea8662
font_02_sfnt_off000116ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AE 17900 bytes
SHA-256: 4858363dff3c61fba994ce74cb85a41eebe57e75da390bf4b7fde7e4fbd0283a

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