Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea25b682a3a90d18…

MALICIOUS

PDF

99.3 KB Created: 2021-08-12 23:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 03ce19b8744565ad41d550dd7031ff90 SHA-1: 33d859410aeabc0d080add0c800cdb6058d4c94c SHA-256: ea25b682a3a90d18b594be8e0c772e437f2eac4efaf0a9ee19548a6fc3b4112c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://drafthe.ru/uplcv?utm_term=how+to+reset+aqualink+rs PDF link annotation
    • http://ltptech.vn/uploads/userfiles/file/gapunubutogixapif.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/piled.pdfIn PDF document text
    • http://mcleod-bobbitt.com/clients/64742/File/78689685620.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/78636931556.pdfIn PDF document text
    • https://brakos.it/file/66210854576.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0d4dde621---84288035275.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/2cate3fit5pjnh49ms4p7v42e3/nebokofunojolowuseladon.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/marewujivubo.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53db107a34---50000656772.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/82137883153.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f14cf06436b---pixalow.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/sutixetozulisijadefi.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611276a888a6a---7507758938.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/3284cer7vn0ede6b4gcervtscq/71553037513.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/fipexepabisobijolabo.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/79753008047.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076e1c53a6ca---webapadavabidavi.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607d843b9ce71---fotalulomofavujemifeb.pdfIn PDF document text
    • http://chipgene.com/image/files/20210706_050643.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/2aa23b0d5df5d64725cce01bd14ce702/komasotawuze.pdfIn PDF document text
    • http://turnyras.lt/Files/file/42283784423.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/1109552542.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_off00011cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDA 10516 bytes
SHA-256: 3fa475112b8662ee278512ecb1cbf1b1c4e3b09778e04d9f9b257e7b3eba81dd
font_01_sfnt_off000134ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EE 18716 bytes
SHA-256: c8b61406d27d824bba0b12599bd112baf81902bc73570e6ee6c9e4d1dd68ab84
font_02_sfnt_off000166a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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