Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72e16326b0d6b81…

MALICIOUS

PDF

89.3 KB Created: 2021-08-20 07:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be338828a5c0dc5e552940ec706ea3b0 SHA-1: 3d8bfa53297637e01ed0dc7fed9ac1d2c4f48853 SHA-256: f72e16326b0d6b81fac4b7c0f0ada3c49fc973c4312fd73d1ea25dae5f57006d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=solucionario+libro+lengua+castellana+y+literatura+3+eso+santillana PDF link annotation
    • http://noahmission.org/dataroom/file/fesav.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fe927679e---riberisovewebav.pdfIn PDF document text
    • http://feast.to/upd_file/10527286343.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/midusurudagidajotidomuj.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/ritasijisevomuberuminu.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/jotolojosojub.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/h64ia25f9ehl9i8kooejqbccoa/26873454931.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/fesejufasikabovezowij.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/82155595035.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/nanodez.pdfIn PDF document text
    • http://merwepizza.com/upload/file/jivelemati.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/fufafit.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/9debbee3ab70792de04e33b073bbe2e5/29188205671.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/gitujitoxesulatifuwakome.pdfIn PDF document text
    • https://msvadba.ru/files/file/94184836547.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608778e82d82f---96723856184.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5a7343160---tifixubok.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608509646e70c---mavusuwegu.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/256822e831e52ce44219cd6343c90442/46560250153.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/mbj0b9pmn4a5dmoinamo5j17pd/14112018848.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/zosefevadudumoxunat.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/fuduzinexuzulosi.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611080666795b---laxufaxofegikesubepa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 18188 bytes
SHA-256: 0d2feaa1e9b7923f314646feabea1a3f4bd54414bb7f063e6e328202e661b33a
font_01_sfnt_off0001254f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254F 11008 bytes
SHA-256: 7245c9e7bfbc84823936a009bda3b734f38a316a851219aad38ae037778a4a45
font_02_sfnt_off00013f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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