Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3a3df054dad4ab…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 18:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a3799ad6f4d876e111ed6d9638344f98 SHA-1: af53c2c706bc06c3c108be3e7437c698844aeabd SHA-256: 3c3a3df054dad4ab45415d7c7b6ba7496e7d203c153fb6d0c1b4792d834e0d7a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The presence of an embedded JavaScript stream suggests that the PDF may attempt to execute malicious code or redirect the user to further malicious content. The overall pattern indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cartonwrappingmachine.com/userfiles/file/sexolison.pdf In PDF document text
    • http://arcomproltd.com/userfiles/file/35204823117.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbd817107c---rorunubipipes.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d3f34d0fe62891e4ca4fc4ae25d53c83/semowawajixezurovok.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c241e7b33cf---67391927431.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/1843514882.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/37260714377.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/fc928c8b73d5d86ddb736f25501e4bb6/gagizerujaganokiwizefi.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/4aec15ceca5a1cb00a71fdb4cbffe2c4/fujovebetomexisonas.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/solis.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/bawutudalisez.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612af20fe9158---50103321630.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9b04290055d9d530e9bfb28165fda924/mivilovogosogud.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/pokulevufegawigifefab.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210628035738.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/rotixopemukigon.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/62052064535.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4ca2ad4ea---koxolelimig.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/98312075744.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/40b040738e5d3c643fd9bd35232d5410/zetegizom.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c831b0822d---lozirarejexakifivot.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/rotob.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/58137166136.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/78032621166.pdfIn PDF document text
    • http://strandedtattoo.net/file/6060783989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ectropion+entropion+pdfPDF 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_off0000e2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F6 17128 bytes
SHA-256: 67e07fd8e86b0c3197de17454cf787e39a0e2e20354858eeef1084b4c959eea1
font_01_sfnt_off00010f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F14 10220 bytes
SHA-256: 9cf292502a049baff99903a09ac95757524b609b021452079ee955a8831fcca9
font_02_sfnt_off0001260b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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