Malicious PDF — malware analysis report

Static analysis result for SHA-256 de56fae7780d06ba…

MALICIOUS

PDF

77.3 KB Created: 2021-09-02 22:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ac1fa3299726194f5f6e9292d2e1d249 SHA-1: 439b917f49644a1f37a3fd0384e24d7882045673 SHA-256: de56fae7780d06ba385a5f62a6410e8b0e350082b3f3a24bdc6b34cf4aafbda1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/6681dde992f0440f243c573faedd2e27/28374203317.pdf In PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/185ddd2a9dc583eea868f0ebb9e846bd/nujikopuv.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/52379519887.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/dotelufeg.pdfIn PDF document text
    • https://energooptima.hu/upload/File/13809450551.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d74b7903c---1997250707.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/xidomudaso.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/14705536203.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/famumo.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608832051e3a7---lepapiwivexakipixewesag.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/97742477975.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161202c5aed4ab---82886345366.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/jeragugozonitizipediwevad.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e4c94fdee0229610fff19ab569fe9888/tuboma.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/derekomurofudupe.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ddd12893e3---jetiturajanebukux.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/50377717997.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/bb0d33c60620d3698464ff7f94e07eb0/vafodolaluwofitokirejazu.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079308a97409---19090536029.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc642f2a950---kotetekoj.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210610_050557.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/3501158214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=giustizia+riparativa+mannozzi+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_off0000c72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72A 10744 bytes
SHA-256: eb1cd1f2a59391154d2546fe4175f86eaa4fe3ef853023f32105376f47ae1303
font_01_sfnt_off0000dff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF804 18040 bytes
SHA-256: 42f15f9c776314a4e423ad0a1962bf2a2f4ed1817947a70dda57d3a10b9bec98

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