Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e19da7e0486aff…

MALICIOUS

PDF

83.1 KB Created: 2021-08-01 06:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: feb60fa69ad2ebe947682ca39ef48f64 SHA-1: da38624497ec4e256ffc5a047291805de8cb102b SHA-256: d5e19da7e0486aff05b0d97b6b5357d10ed37953416fdfec57c4366e46be96b5
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ClamAV, indicating it likely exploits a vulnerability or contains malicious content. Heuristics identified it as a link farm pointing to numerous distinct hosts, many of which appear to be compromised upload storage locations. The primary purpose seems to be redirecting users to potentially malicious or phishing content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3499

Heuristics 5

  • 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
  • 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://duhocblueocean.vn/ckfinder/userfiles/files/koruporefisasuj.pdf
    • https://havadisname.com/upload/ckfinder/files/widujoputukaboxexafuvedu.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1e2642ca3e2aa03bca92ab6a3447b6e2/puxabolojakugimamuxil.pdf
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vederakogevej.pdf
    • http://ritadas.in/userfiles/file/69104332960.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098800948987---xinowejopewokere.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/64d2f0f24ebf4ed5388e1fc6cc2b3d42/tenogefa.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/546972d8e6936bd89032ba150f45e140/falusokoputemufi.pdf
    • http://www.moyekolodin.com/files/xesadotikafaxe.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f15caed595---35486903010.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b35671a74---78561191258.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/u1uqcbap5934jnj2mi047vlna9/2413864547.pdf
    • https://paklya.su/design/img/upload/file/69409282087.pdf
    • http://chinoboxingclub.com/clients/36032/File/bibifigimajijuwosewoxusov.pdf
    • http://randoquad72.fr/userfiles/file/zivufesobigusazepemadi.pdf
    • http://johnmarzillier.com/ckfinder/userfiles/files/32561208118.pdf
    • http://weingut-suppan.at/files/vozupotodegamimusegorilaf.pdf
    • http://novichiha.ru/pic/file/63123938584.pdf
    • http://burfel.ru/upfiles/files/30032309633.pdf
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/eb7b7869a9be9754fad2ccd2cdc456aa/80498283513.pdf
    • http://shuimotongyuan.com/userfiles/file/41185029889.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b13a617f8---33417236085.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/9d61f3b3d568fe558da79e60dbdc64c3/gigowosevawobim.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=como+fazer+costelinha+de+porco+na+churrasqueira
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 16792 bytes
font_01_sfnt_off00010cea.bin
3b49625a50acbf9ddb85e0cef76bf541188226da83532b38ade7d892ce8e52f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 18712 bytes

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