Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb1fde592814825…

MALICIOUS

PDF

84.5 KB Created: 2021-09-22 15:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73517af2dafc8c307b77bc01ea7173de SHA-1: 938ad930865f228cc324289e17af5c63e6791d6a SHA-256: deb1fde592814825198a5a1693fcd6762fa232f5a2ef9c8269e6844f81eed5c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Heuristics indicate it's part of a link farm pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=android+phone+as+usb+modem PDF link annotation
    • https://rpdev.org/ckfinder/userfiles/files/68801006352.pdfIn PDF document text
    • https://insp.biz/img/file/ketopifava.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/nowozotekixaderupujovu.pdfIn PDF document text
    • https://curvy.tw/upload/files/palekegijanipomigowuto.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/70686538089.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/gaterilesidesitufopiketoj.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/najugivipoku.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149412f12f80---vusesitunokufupixebig.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613508141674b---96403802958.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/34043692695.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/27572610884.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/26740454876.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/zugijobi.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/40336299723.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210905_350B62A693551AF2.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/71179786860.pdfIn PDF document text
    • http://ekosertifikat.uznature.uz/userfiles/file/joxexegiwetuwak.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/15578069524.pdfIn PDF document text
    • https://wittnebel.dk/file/fonapas.pdfIn PDF document text
    • http://stisk.com/file/diwobodubonagigi.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/17485293516134ebd0dcef3.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/88993669064.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138df28437ee---nogutid.pdfIn PDF document text
    • http://elezioni2014.gds.it/userfiles/file/41668854227.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_off0000e5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FE 17656 bytes
SHA-256: 7d3eda92d96bbb433d1afcded8618460ff30941ffc4b6d6ffa79c46f414bd877
font_01_sfnt_off00011438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11438 10736 bytes
SHA-256: 4fdfc84b36b7d1004ba1f7d3381eaf910e71b4eaa9be845c0147b5dbcf118c1c
font_02_sfnt_off00012c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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