Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3c0d9b64ea083f…

MALICIOUS

PDF

78.6 KB Created: 2021-08-29 15:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8bac1db6551e2dcb7bb092cbab6a79f SHA-1: 7d3f8ec6d9f727b7e04b9488f9ce8e3cb4759b3f SHA-256: ea3c0d9b64ea083f1aec2ecd4afcb8cb77d6deb8f1c795039fb16ee2356e8e6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or link farm attack. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure itself is weaponized to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=anti+rabies+for+dogs PDF link annotation
    • http://banlinhkienlaptop.com/userfiles/file/88747962376.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/watoju.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/78093748776.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/fc7022c7978a0c79f51105875a84c703/19435582070.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/43413570425.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/55189504280.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/bjl1uf18cf59kjkm5mmobn0oj0/22567133352.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb464b76d2---12288092021.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d2de68cd6---wupibimesejijivuku.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/sikezo.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160760a1678dfc---xepupotuz.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c42ba54d39e1fc9e0b298d2423c4614f/nenepokizaraf.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/91254a593288329924a929a3f85eab64/koporafivodakudipuki.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/64981846557.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/fd050f9f81761e295c5fedd7c2d1ba1b/57940036405.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf4f56f59a---xiwipexoxudosi.pdfIn PDF document text
    • http://pvvc.cz/files/gegekipu.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/fonegemezinazu.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210703_011231.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fd6865fd---motavulakixopogetokibidow.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/kedinazibugibenunovivuv.pdfIn PDF document text
    • http://kd-council.com/upfile/files/risevubifodisawutojuki.pdfIn PDF document text
    • 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_off0000d09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09F 17036 bytes
SHA-256: ca50897849e62d58a5d419746b16a719e74110d70d46b8ef0ca32a9590b90247
font_01_sfnt_off0000fc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11497 10604 bytes
SHA-256: e6c78727b61f58f9f5d06be1040e1db667f574e93ea9352b99c8d5e86545d6c2

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