Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca3d39efe183699…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 17:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6bdf9c48fdab56e140580bf140d2753b SHA-1: 516142e69bd1270c0709270f8cdeea5af1000c8a SHA-256: 7ca3d39efe183699779415d535e8d77f5098fdbe56912919762cdfc9ad6bc524
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of embedded JavaScript indicates the potential for executing malicious code within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • 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 http://zavalinka.by/var/upload/file/670875409.pdf In PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/5v02sl8ocefm0g87l6tcq7rbo5/kokadevunetepuwoji.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c31cfef2ab5---14440260087.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/82385751185.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/17019195541.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2230ddd80---gorebidaloponoxa.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d76d2081af4---galiwodabotisonevisumaf.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609651f2aece1---76613980745.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ddc95871a---41020224642.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/88315625158.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/wagepafizagu.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf830439ea---mamolizaxovogilutenaduf.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e1c2d4288---38011740914.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/23564936198.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/rekukotekeluzazutowetagal.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609463a1a30b7---984762669.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16074484335d51---kufalo.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/2407931062.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/10786009500.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/drvf5k99cid8erdm2vkkq64ii5/63850725565.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ctcpt3gi6vqhra2f66nguss573/37657415319.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210831020402_575055250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=infantino+carrier+instruction+manualPDF 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_off0000ddbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D6 10548 bytes
SHA-256: 70953b55429faf5fc473307be44cdf6034d464aca7a03e694d0e673544f1ef8c
font_02_sfnt_off00010ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDD 19452 bytes
SHA-256: 54f09503417a03fe981aafd191f14ad558599b6b7eedd4d35c7db5a0a6741414

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