Malicious PDF — malware analysis report

Static analysis result for SHA-256 19811004ada606dd…

MALICIOUS

PDF

82.0 KB Created: 2021-10-08 06:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d363d857eba0d410b30260d6ed653113 SHA-1: 53a4a17564ab38c58a6e637f79c2e9a9c940e275 SHA-256: 19811004ada606dd2d94f91db07055be7722ff8e7972615c831b363f58fef787
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these linked PDFs. The document body is heavily obfuscated and does not provide direct textual clues, but the overall structure and URL analysis point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://amoy-art.com/Upload/file/95175861367.pdf In PDF document text
    • http://inspeq.eu/public/files/gexidi.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/mukuwebigadatigokipeb.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/a95d3592ba99a3e923223ed09ba272a8/togepegifuv.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/57511267820.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/30796592631.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/muzututugeziwewumojivip.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/063d449c8ede019e7ae7bf91bd077f61/63894050576.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/gufedexadejunugote.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/49684403624.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/powipiwow.pdfIn PDF document text
    • http://dongphat.net/upload/files/jemosizaxal.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/80993736036.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/45965456469.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/43251870522.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/3878702047.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/32238617215.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4ce382638---bewuni.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/90946699694.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/65623858604.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/85169537048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+write+a+television+scriptPDF 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_off0000da34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 10512 bytes
SHA-256: 176a0cafdba20607553f75daf0f2d783c3f27692c6920286b52b558c03cf594d
font_02_sfnt_off00010a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A59 18812 bytes
SHA-256: 3d4b9f9fcbbbd4b93e22ea11d5599792f6a975d1a610098a73705c890c25ab1d