Malicious PDF — malware analysis report

Static analysis result for SHA-256 d67965d9a93a938f…

MALICIOUS

PDF

87.3 KB Created: 2021-07-22 17:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b6ecfbd9786920064a572d6b9760f9f9 SHA-1: 621f6009328ff5016bb73d374c98c058aa4e8131 SHA-256: d67965d9a93a938f9df7b37d06efa0cc747d3179939666d2e34ad26681ca47a0
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised or hosted on disposable infrastructure. The primary purpose seems to be redirecting users to potentially harmful content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://cancercareresearch.com/userfiles/file/silasuxinolidebanariw.pdf In PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/devakedifupuregem.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/bewusodet.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/1c9a570011840ade7273a65bd4fa6a26/vomekepata.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/40201536974.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/91lfsbh4l5ueoue0ssvr3j4jpb/7770761679.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/95115755286.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/rc5mvc97pqanqpiuq2nh92hs72/37766262158.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/ninexik.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731aab3ed84---44469751779.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/48b163dc247e15d932499244f1eb1730/xilizuki.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/duzidoxoxomedofidabez.pdfIn PDF document text
    • https://birutelorasin.com/contents//files/duxovilepo.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3d072c8d3---poloponosaki.pdfIn PDF document text
    • http://usmleworkout.com/files/file/petor.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/71u6q41l0hc8evksev2br3p3ji/pokujufozizoforisazo.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/6710499086.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e81ec99fdba.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/ponasa.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88d4176719---bizuw.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/84726938179.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3f934d07e---1234220170.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/72938724143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+use+circumference+to+find+diameterPDF 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_off0000ebc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 10768 bytes
SHA-256: 7cda575f4edfe9eb2a858f1c4ddec3dd2bcfffc1b91faf9769d55a4ac656ea4c
font_01_sfnt_off00010498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10498 19068 bytes
SHA-256: 4b94323cb59193ce7667e6d79201029f0c3ac8c2e9c627651fe48e51b0e38dfa
font_02_sfnt_off00013639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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