Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d53d7ffe4c0393…

MALICIOUS

PDF

87.2 KB Created: 2021-09-08 15:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1bf4d18ab7b54640bf470de25c350c97 SHA-1: 4c05114e3db1991af8d6400c008b84658f2ce6fb SHA-256: 82d53d7ffe4c0393391c2a9b1b4e77ca077d17680bdaea66f3aa5319a73d35b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing an embedded JavaScript stream, which is a common technique for delivering malicious payloads. The PDF also features a link farm pointing to various domains, many of which are hosted on disposable or compromised infrastructure, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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 https://imaggu.com/ci/userfiles/files/kovesutomabu.pdf In PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/noxazazexirurapim.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/magasivep.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130232428f88---tovudajoxakov.pdfIn PDF document text
    • https://egf.tw/test2/images/file/37230768910.pdfIn PDF document text
    • http://land89.com/ckupload/files/4580572270.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/durabamijoz.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/83038719547.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/49778330175.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/54174024205.pdfIn PDF document text
    • https://alutat.com/data/file/begoxag.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/zesawodazofizepirep.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161362d5a7b16f---lonepulifuliruwawevobete.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/jesogukov.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///jipixojufuta.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/53156030511.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210907224323.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/36037767418.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/tuwiwitosijavarufegenex.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/zelurubozekukuvezefinem.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131086ccc9b1---68251641274.pdfIn PDF document text
    • http://merwepizza.com/upload/file/jevoba.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613355b67a5ca---26722342805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=american+pie+book+of+love+the+bible+pdfPDF 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_off0000ee72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE72 17364 bytes
SHA-256: 0bef13aed1b0517757a8d18d7eec6dc837a8fa4513afc5669627013cac5ec39c
font_01_sfnt_off00011b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A7 10996 bytes
SHA-256: cd436c723dd7f77e2b40ac1f55c148ed1e6dae4eb6c1d90caa603e71dac4f85b

Open this report in the interactive analyzer, or submit your own file for analysis.