Malicious PDF — malware analysis report

Static analysis result for SHA-256 09caf3e5a7307d3c…

MALICIOUS

PDF

90.7 KB Created: 2021-07-02 12:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da6997ad45bb31356ec187b563e7a639 SHA-1: 19f2a6fdb8dc813319cc1f592e6b4ce77d35be74 SHA-256: 09caf3e5a7307d3c27b7a922a55afea8e1a383afb4d9e44865eeb5071fc271fa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://woori-tour.kr/FileData/ckfinder/files/20210609_D66F9861DEEB6506.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781d9f20063---41474188772.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/14a83d78012e1b6167bd0e003b6a002b/vuwowebuvogefopivegarilip.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1b935a31e9e47106f299d08e5c1e3a3f/mejimuxoripolinu.pdf
    • http://www.serenissimaservizi.com//files/gunepofuzizesagixoradodu.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/b70q581phc8amc8eb2v69psnrd/vujujunipifotug.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8aa01a2c6---xutakosoxibazibonojo.pdf
    • http://minhvuongthuphap.com/upload/ck/files/zijumipawe.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e48ff6a5d0---junavim.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/66a9a7d6c8e61e3dfef51f5089cfab86/jezalaman.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9891be7e---dilemiru.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7990e4930302cd8929287b2bce61cd75/wifavi.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917cf0c0b02---tilaxup.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/edd79814378f3db948f6b21373439312/79929220064.pdf
    • http://quickvideo.nl/userfiles/file/bekujupuwamalu.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094c43aa06f5---2872662807.pdf
    • https://bodymart.in/ckfinder/userfiles/files/femigezifadonegirimo.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/6e2de0fdc0d49f91072a34ea26f8f72c/bidedawemexovawobomovi.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/1623243680585.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/sq82l72he85ebgp0hohn0c4q16/kiweg.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d085449673---49567646146.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/tf3hg1mldjruqbd6soadffklvh/wemekokewobino.pdf
    • http://classtool.info/upload/files/50122900144.pdf
    • http://fotossc.pl/_files/file/267998211.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=clubhouse+app+iphone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdaa.bin
9ee197987e4d48ee61e252dba5164aaf290b0a1f010421857869e2305d3854eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAA 17992 bytes
font_01_sfnt_off00012c9e.bin
d8cb5e9db5a70466bb57c65752264b287af981777d3d9f9854d83eebd7f3964b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9E 10424 bytes
font_02_sfnt_off000143f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x143F1 16792 bytes