Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c2f1cca65211f0…

MALICIOUS

PDF

74.8 KB Created: 2021-09-03 06:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 62b92bade5ea48d2428dd92de1d0903b SHA-1: b81ec1a16231f3a0c172dfcdcc900f4e52563520 SHA-256: 74c2f1cca65211f02529e0cc005a9ea639c408ddd5281bd1cd2fc2d52b477f09
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of external URIs and link farm indicators strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/7tktroknjfgg98u9sutnc8ed7q/8765495731.pdf In PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c7d048994---19185889424.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/sewabi.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a25f263170---48912301856.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/tuvizifibosajaniwutuvo.pdfIn PDF document text
    • https://afayl.com/userfiles/file/89674126405.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/86588018103.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/lofolugiwakak.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082a68014e46---miribe.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/xinafudefikokaw.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e9e4d2c771---togovo.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd98479ae0---nobewepik.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/xomowanawomufivowaxa.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/ienf89qjthijlbrerpm8d7n30f/bizadikafoxer.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/65ce41bc311bf877fd31e7139fe8019d/64423164205.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609725117e0c3---kodikozoto.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/83883120945.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/fanijofewexasejavomope.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/d0004d93f3a9f61c0ae973107ff53bdd/31236079249.pdfIn PDF document text
    • http://turbooto.vn/upload/files/36296553095.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4495bcd19c66150cbcf596ae41120ce9/88773846851.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091668ef2151---bejazefalipimuduxazox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pdf+to+word+mac+onlinePDF 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_off0000c3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F1 10556 bytes
SHA-256: cede83929dcb7da12222ba0bccbd6e1ec2be977a00ba81ee84a4d6af84b7bc43
font_01_sfnt_off0000dc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC08 16460 bytes
SHA-256: 9ed47b907d54c7db9b7067d188f10049ff9486ee1590201bd05943f6dbf79770
font_02_sfnt_off00010628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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