Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fcaa96df928392…

MALICIOUS

PDF

101.8 KB Created: 2021-06-29 13:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d40fa25977f856a36aac1674bf7cbb9a SHA-1: 273e24f77f23bba10fc10fe028585e520336711f SHA-256: b5fcaa96df928392bc2d7912807f7de0264c5fafc627a54b16c3d2280a49a69c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple suspicious URLs is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://vantaibactrungnam.vn/upload/files/gebivus.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/so9b6lbke6tjoqvdm7ijfg6dt7/buxisigesasut.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/pls6scng19rnnpdi22hkn8oacl/52524746.pdf
    • http://cottoneauto.it/userfiles/files/tonurebotiti.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e3ff72609---36836278587.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/d1db76d994e12072286ef90e79fbd61f/42644521503.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99ca59368---58097578854.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cec6b5a68---tuturikulukavupo.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607944067ab53---sopaz.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd9b394370---zuvitu.pdf
    • https://sssmri.com/ckfinder/userfiles/files/madulaz.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606c970d31324---63391024198.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d3bc8e90b---7524619464.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609207a91be00---gujav.pdf
    • https://tsafar.ir/basefile/tsafarir/files/tizubokizadupuno.pdf
    • http://coeb.eu/userfiles/files/49828492444.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607d898f3ac74---84673933448.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bd852b20db4---tewafuvosarigarepi.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/fdada2090b484dac48b2bf8096a54924/zoridafukaxusojotip.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b13551bed05---2144086128.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/vdudcsdqjf0gq8im6oqbk69j6e/ruzebowukavof.pdf
    • https://chaplains-camps.org/upload_picture/file/41709531839.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/23194638352.pdf
    • https://proia.bg/userfiles/file/gelewixodeti.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cool+superpowers+unique
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b38.bin
d9f64177cd63cdaf1459c775a019121426da3f2704a595c5e258cae21d8cad86
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B38 10348 bytes
font_01_sfnt_off000142bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x142BC 16792 bytes
font_02_sfnt_off00015ace.bin
53fdbecb76d392dae993f83a5d8e0ef08fe0d759c4dd2182fd0c46499f347bce
pdf-font-stream PDF embedded font (sfnt) at offset 0x15ACE 18188 bytes