Malicious PDF — malware analysis report

Static analysis result for SHA-256 3656e9b4ba5aa503…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 20:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a1ceb73c2e7fd5eb560bdcac1d28a019 SHA-1: c3976b13c978335b97504f60d4cf4861486f024a SHA-256: 3656e9b4ba5aa503ccf64f958022a541414143b4cfd69bcb0fe926f78d85db91
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs suggest an attempt to lead users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/u738bja6peorkooag9loeur6hs/jozotasutirelel.pdf In PDF document text
    • http://topoint.net/userfiles/fckFile/20210904175814.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/lazatigemot.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/vikejo.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614948a149f86---25331305430.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/nadukikamosifijuvuvuwesab.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146761e8f436---75311054926.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/12584290528.pdfIn PDF document text
    • http://viorina-deko.com/images/file/gibirusosijoti.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/39600943149.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/wamozozegulunodap.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/waximavobemek.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/wosolipo.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/57791901680.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/vikafazamuloga.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/xamixutisepefubojebawesew.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614c78869db71---15834448380.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/53013857624.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/62ce903188e6d60a5467ebeb864e8ba7/78157146625.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/nerejutowifidizosijul.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/4476765218.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/92657064118.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/muziwisitabuderigomafipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=dragon+ball+z+xenoverse+2+apk+obbPDF 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_off0000afdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDF 16912 bytes
SHA-256: dfade7a1c2bd7bb440cc6eff9fbb76dd0cabf01f8c15282ee2e77814fee5d5ed
font_01_sfnt_off0000dada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADA 10820 bytes
SHA-256: 48c6df7aff878d16bdfec43d034ab5ae68734bb9c181fa0a44a3ac84b1fbaa16
font_02_sfnt_off0000f3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1