Malicious PDF — malware analysis report

Static analysis result for SHA-256 315d3403099bae5c…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 08:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8005d4bc81387e0f0efdf11e6d82b0e4 SHA-1: 351b9e5c49ace280ea0a6bda714008fd9141feda SHA-256: 315d3403099bae5c2a19e06ca37e48f95ba1268ca16761a80fb267882aca8aad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/uplcv?utm_term=a+sound+of+thunder+questions+and+answers+pdf PDF link annotation
    • http://yildizteknikelektrik.net/resimler/files/pixasefegenipo.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/3568479250.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/kudopef.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16130981e7fdff---nejesekubez.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/dexepuperuratom.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210912_3B536406F9712A85.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/56493599120.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/51060629638.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/linofejuwokalojuvapa.pdfIn PDF document text
    • http://alvitraders.com/files/rawut.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/17931348801.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/vimonawuweborojezusovari.pdfIn PDF document text
    • http://samtle.net/ckupload/files/bawiporobigogalava.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161380be1130f6---vikinu.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/78767151315.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/23142441041.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5954b4329a3a6be358b05b762d25fdec/90796272187.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/25500185568.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/99284518006.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109060610577007.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/xotizeraxafakejikabaloro.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///womevutoka.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c3ee777b8---dotizixigebebakexomag.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/remusadubevijasa.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420211b152e---17752643631.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/67446095093.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D0 17604 bytes
SHA-256: fb4be58bef97eb5b4c52709a9995f3b18ac15226c857dd16eb780c18c8f55472
font_01_sfnt_off00010584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10584 10864 bytes
SHA-256: 14ed909c568a96e0efcfb51a47cbce533e1c3e93fe9711fea2dd047847fe1553
font_02_sfnt_off00011e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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