Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6459149d393d9b1…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 19:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e25c89fd6198089e7c3d8aed6ad0dadc SHA-1: da9e780b70cf4fde3b6fae871b92b074b9a4a586 SHA-256: c6459149d393d9b14291d7a81c7d14fe8d72faa7f6740e0a4915a1792835d838
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://sangjeom.com/userfiles/file///surakaxabudufonuja.pdf In PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/susedez.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/newidojofezukeradilafusi.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613184f245695---dejezipigod.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/zirepa.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/80821967760.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/sokatirafilelufopunemabev.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/669254659.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377f0e72427---piwizetajumibiduj.pdfIn PDF document text
    • https://dintek.eu/uploads/file/fudapipivi.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/11705268577.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/62253286822.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/puzokiwivezogow.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/94789639690.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/91916460247.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614448b94d1a4---texekirowu.pdfIn PDF document text
    • http://drironcat.com/images/file/luvebijotovixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=foscam+viewer+app+androidPDF 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_off0000ad21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD21 10660 bytes
SHA-256: df8eea6411a7304ee9a00dc1da01bfc2fb0d9d517416da2f33a706865e4a7018
font_01_sfnt_off0000c590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC590 17684 bytes
SHA-256: 9600bb1e16a268d7e232786976d969d230d9ed232901a2db81767acff1db83ee
font_02_sfnt_off0000f2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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