Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e9d5d1704980f1…

MALICIOUS

PDF

91.7 KB Created: 2021-09-09 15:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5aff027f5dbccd03746346664f89621c SHA-1: d35d8256e2dcc9442b80c041aab971a4037e29ce SHA-256: 43e9d5d1704980f1e1f374e2b2e965341e8a74fcc924931e3c4f64c9a663d862
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on a compromised WordPress site, with numerous links pointing to potentially malicious or phishing content. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to lure users to external malicious resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c9d232c67---sotonovoxakasepelat.pdf
    • http://travellerisland.com/files/72030188045.pdf
    • http://gerd-pollak.de/userfiles/file/69702069019.pdf
    • http://fs-select.com/images/blog/file/61219202282.pdf
    • http://drcleancenter.com/uploads/files/202109071747507944.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/acdfdb4326e437b17e871056c10309fe/fezafapeg.pdf
    • https://icbacademy.com/upload/files/kedezivamisituduwatogoboz.pdf
    • http://bulmarconsult.com/files/xopugusagi.pdf
    • http://phupmirpol.pl/userfiles/file/kodijesovi.pdf
    • http://mebelhotel.ru/images/news/file/bikajo.pdf
    • http://coinproject.com/userfiles/image/file/33407214730.pdf
    • https://novsport.com/content/File/wovozevomuliwu.pdf
    • http://sicompk.com/survey/userfiles/files/94390986815.pdf
    • http://claudiamelchior.it/images/file/wasej.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130095e38155---varemubimuwemo.pdf
    • http://pagyesa.org/userfiles/file/20210905112125.pdf
    • http://kidneytracker.com/ckfinder/userfiles/files/geriwu.pdf
    • http://kukubara.com/zdjecia/file/24561263978.pdf
    • http://kommunikator.nu/demo/userfiles/file///buwemew.pdf
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/16024611404.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/dosugetivonozapejevagu.pdf
    • http://imhome-listings.com/userfiles/files/51441386755.pdf
    • https://pepinieramontana.ro/ckfinder/userfiles/files/34029816232.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=file+manager+ex
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e42b.bin
b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE42B 16148 bytes
font_01_sfnt_off0000f9b6.bin
4445224e8886e873214158390cb5b2af7261e96c04dbb492a0f24668b0b87ab4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 21144 bytes
font_02_sfnt_off00013249.bin
ecdaac0fe369a19fddeaa72c3c02b8aabe7a25d817a0a6b502e58d5d86eec035		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13249 10144 bytes
font_03_sfnt_off000148cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148CD 16792 bytes

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