Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce038cfd2c8f2528…

MALICIOUS

PDF

96.3 KB Created: 2021-09-18 05:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 801a9f5281f9c3db4b1336c4a893446f SHA-1: a3ea2e186624df313e701a5cc99b639979e8f632 SHA-256: ce038cfd2c8f25280f83f4b8a0cbe7fd37eb7d3e154a9dfb810c2e226cac201d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The document body is unreadable, but the heuristics indicate a focus on link farms and external URI redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://vino-charlie.cz/userfiles/file/13929855419.pdf In PDF document text
    • http://arqing.es/ckfinder/userfiles/files/34571151466.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ce24db1992feb854825b997de892c777/wegaboviti.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/87bcc5aa8fe2a16613963dd60fd71558/72344345275.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161364303c09a2---45998979219.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/61007008114.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/zagazojozuzi.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5a468c238---vonuzogalodidibebelujib.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/98913665624.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/6d0ceb37226db0b13af385e77e289753/24620160459.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/zajegejabukagulen.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419a5dbdc70---muzovotuwipuvoburuwasejom.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/74f8d070b713d1244125ef1bbbd4861c/sedovejuxivelasurebarav.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/nujezaxubupupanano.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/nabunesaxuresidisodeso.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/dexawegipatukarusefedenut.pdfIn PDF document text
    • https://network-italia.it/file/morakipinutigejurutop.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/90917006228.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/5955400226137d392c4afb.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/18669569754.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/50576541145.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/nogeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=whatsapp+parental+control+iosPDF 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_off00011465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C77 18088 bytes
SHA-256: e260f997bf3aa12baa0828bddcf9dc7240c0ffd39ddf57bad838e9aba8280dee
font_02_sfnt_off00015bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD5 10464 bytes
SHA-256: 990ecb5fd94650a4231f2c4b9c70c8df702880ba028bdc6207ede7d76ad54851

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