Malicious PDF — malware analysis report

Static analysis result for SHA-256 5117867b784d2886…

MALICIOUS

PDF

83.5 KB Created: 2021-07-12 16:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 65817846c1158a3c2d57225b98d39b91 SHA-1: cbc7cfd72009c5c134e7077fe0225d4397ed2763 SHA-256: 5117867b784d2886390d526d770814f546a1033aef2061eb819f2871a18fdf8a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ClamAV detection and the heuristic findings indicate this PDF is designed to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the structure suggests a link farm intended to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier clean score 0.2133

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://irlanc.ru/uplcv?utm_term=slow+cooker+appetizers PDF link annotation
    • http://billedbutikken.dk/articlefiles/file/44937467804.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/9c26933d5aeaa20b6ffb0e350981c515/73057330525.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/37487908359.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0be0e09476072a5502ac662df9c86d9d/56734786491.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d080eaac552---29739112434.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210607020951.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/jewexa.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/048bgvt6c77q25p4ogosqt3p42/fidulozijozuro.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/de8a96dff8cf9926bbbec0bc14b97f3c/89158971517.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/galur.pdfIn PDF document text
    • http://isgsrl.it/images/file/gafeluperufamovif.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c793ce1a70e---maxagivaw.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/zirasog.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d6cb242efa8---67952415335.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4db67d9a2---97529114570.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/rejojimasurodimumise.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/1587502793.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608378fbc7ebc---43573890205.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/dijugoletesujopivizodomix.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/midotajezapadewawabem.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcffa955e0---nemimisa.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/womiwulebudodoligivugitox.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/874a22b8eb228592e2a51487ecca4a90/81241705430.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da216090ee1---pixinolegatojorasubor.pdfIn 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_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 17220 bytes
SHA-256: ab64f302e07b41ef38f03246a97c0cd613a1288269e46b3807d57e8c40c5dcaf
font_01_sfnt_off00011bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 10576 bytes
SHA-256: 404fb9076a72e7d1170748adb5e61d4815c120aa02dea9fe7c66a758a6b64d05
font_02_sfnt_off00013432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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