Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76845fa6679735e…

MALICIOUS

PDF

119.5 KB Created: 2021-09-16 11:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 347ff40a3affc7e04309497d1d4f3e90 SHA-1: 4dd26a3824db83a1cecf3ae37a77016836061914 SHA-256: c76845fa6679735eb4658d0b7432519ec4e841efd82d74ff651f9063ac4a4eac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that may leverage embedded JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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 https://nomylo.ru/uplcv?utm_term=bhagavad+gita+telugu+pdf PDF link annotation
    • http://amicissiapiemonteisa.it/userfiles/files/15943082449.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/luniwamusasidonovenamitan.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109070115376225.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/38609566914.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/26377789834.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/zefewofeg.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ad2f09013---29196216290.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/87809975166.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161413dc26f88d---19755230021.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/kolebob.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109070304089589.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/runikifovaroxafat.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/xosogefosenomakeregiko.pdfIn PDF document text
    • http://tradotel-riviera.com/file/xejabikitozidiboj.pdfIn PDF document text
    • https://kaparatt.com/images/File/zugoziwi.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613395a497b58---89287678040.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/41975660964.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/58217397567.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/36795877541.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb41355e4f---88732888845.pdfIn PDF document text
    • https://successalpha.team/upload/files/walajegijifadezid.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/pugovewowufevexazexelato.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210914_06ACC4E3C093286A.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/919a8dfa57cd22dfed4801b24acdd35a/fotarodemobetu.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000139e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E0 28024 bytes
SHA-256: c0c904563d15a3d604feb6b103f0d475548c93984d182ba07607860e3f7db10e
font_01_sfnt_off00018089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18089 1712 bytes
SHA-256: 631ca8c84f01fc1f591e278f46ffe5b63467985ac0bd5d939c135cf401a2b01d
font_02_sfnt_off000188a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001a0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0BE 10504 bytes
SHA-256: 8f4e56d407114d7971420fdf203b174cb01bee1e064f87da2ff14d3f77dc516f
font_04_sfnt_off0001b894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B894 16468 bytes
SHA-256: 0107657b2b2a7c445c2b97caa509c5c25ce6f43c3b8e093c2837f18459e88df7

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