Malicious PDF — malware analysis report

Static analysis result for SHA-256 de45585e1705968a…

MALICIOUS

PDF

84.4 KB Created: 2021-09-11 03:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a6801efc4d6ba6746aab459f7322b808 SHA-1: 150e55a5baf34eafac374d1e3b92901e8d217d7b SHA-256: de45585e1705968a64371c1868eda3fc1f7c667467cfe3adce98497edcc077dc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://laborke.ru/uplcv?utm_term=agatha+christie+murder+on+the+orient+express+read+online PDF link annotation
    • https://www.meditech.cz/ckfinder/userfiles/files/nosevorun.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161365cdd46a92---75154192972.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b487a5a46a---reripuja.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/1673126592.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/lusubanugudibifozij.pdfIn PDF document text
    • https://tdfstore.it/file/felab.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/9a33d66ddaad66548c6c141967d2e6ea/xelemad.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/72423394093.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/kuwiwag.pdfIn PDF document text
    • http://exima.kr/userData/board/file/91040599544.pdfIn PDF document text
    • http://gaudi.tw/upload/files/wilokutebumi.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/34172333358.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/jifezafokot.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-3/20210903021854289519.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/kukadekisidonutev.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/71782118020.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/31976654219.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/29284713224.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/saradopura.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210909232806.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/89201049868.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/574sdl2b51vqhrc90bfjnu34k8/wuvofememekivakodofiju.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/rafufugonakuwularidizipev.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_off0000defa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 11144 bytes
SHA-256: 48af8780a9d797e2911ab6f9149a3ab5ef0c91a45aaba4598ff0ddc1b6545f9b
font_02_sfnt_off000110c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C8 19276 bytes
SHA-256: 88268878f881a2f85d4646f189814a5672fb265713ede55864ab475ced66c531