Malicious PDF — malware analysis report

Static analysis result for SHA-256 15192125cac14417…

MALICIOUS

PDF

71.6 KB Created: 2021-09-16 12:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1e95c141e52e547c4d4d58acea114cdf SHA-1: 0e53fb3cb9b6f27f998930d7a32ec0fcbbea9bb5 SHA-256: 15192125cac144178e7bfe5ead7a0b0416e629d6c6ba6bbaba0c9c9cc9228f75
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4eca002a3---tirelubireka.pdf In PDF document text
    • https://vildmarksjagt.dk/userfiles/file/fubirifakepanarawuze.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/844bda2845ad816facaafe794a3011f5/valetibugiputisuxepeneji.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/504820bh9qbjfn25l7esq0dhd4/54282838500.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/1b3347a2b0a0bd44d2eca44e3efb722d/27223013338.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad7f3e5fac---2673204626.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/21085274652.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/xifopitawawu.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/sobotet.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/weriselug.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/pesewitekirewar.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/34246983180.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9b886dde555f7835df787d22c68855b6/koriwebogopekamofamoporin.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/xifitijuwulominegabapi.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/nuguvo.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/40002757326.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613b10b47b4b5---89696731017.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/16719041393.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210916113406.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/31061574669.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4bc5ec9c9---lunipejowiraji.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74486505930.pdfIn PDF document text
    • http://sayarbobinaj.com/file/50950554161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=comparative+and+superlative+adjectives+worksheet+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_off0000b7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A3 11388 bytes
SHA-256: 076a7e20060373c5eb1d4745850dd43634815287d7d051cf05d31af02d1e7397
font_01_sfnt_off0000d256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD256 15164 bytes
SHA-256: b38e3d396abe896ba1ebfe2702555ccd3d038cf96b9aa5cf3899d209eb5d3626
font_02_sfnt_off0000f891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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