Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d0c853247744e16…

MALICIOUS

PDF

78.4 KB Created: 2021-09-09 07:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a04a71bbf2273a2e13a0babc66c11327 SHA-1: 29c3842e8e7c60e4381fda6c99d2fb03646cb6c0 SHA-256: 6d0c853247744e16e4bf87a50de4cffad6ceff1a9eda4cb2cdb0d3701591f93a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or the use of embedded JavaScript to facilitate malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://compow.net/ckfinder/userfiles/files/gomumonenenejafovopidek.pdf In PDF document text
    • http://moscowballet.ru/userfiles/file/40193742201.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/muguzap.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/mevulovamemo.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/laworug.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/nubufibokuvasabigoxezik.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/wezexokojokokilod.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/molikufise.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/tqmiqlsun54fkfhcnb7orkhacr/fipum.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388d4f67e15---34273820703.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/51902828845.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/99316411743.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/16374877966.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/c56b92f5b22e57b9eca16ed6e9af8d20/1154254188.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/peminuwarusonizex.pdfIn PDF document text
    • https://paperland.bg/uploads/file/raxejabuximuka.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/mugil.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/60985773953.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/67765121258.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/16446911607.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/6shcoos8fsn6sacbevj3dvnuo2/34978056238.pdfIn PDF document text
    • http://accesoriosalmayor.com/images/userfiles/file/nafeguzimudu.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/nqkekc0f3gm499g6bikl8bthru/gogatesupabagexadi.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/mekuwijonumasuwuwiwuwakim.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/sasudoregulefije.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/jidaseluragasik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=stick+3+apkPDF 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_off0000d087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD087 10036 bytes
SHA-256: e7b416a8a42a2da5fcb2475a329b524870c6c2a8032409814e3f33b19ae57184
font_01_sfnt_off0000e701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE701 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF13 17332 bytes
SHA-256: 3b0c7fe7553243d128bcbf3162e25c759c831510db5d2f5973c94cfc9f8590a4

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