Malicious PDF — malware analysis report

Static analysis result for SHA-256 64fab4a52e9628ff…

MALICIOUS

PDF

84.0 KB Created: 2021-06-26 09:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3f76097ef77b2c017b1e69161af2905 SHA-1: cc944c5bc0faf23fe6464972427b0d78e5214085 SHA-256: 64fab4a52e9628ffb8718f2c891070c51a69d4397a9cb5fd42c1d53cffca74f8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://laborke.ru/uplcv?utm_term=great+horned+owl+colorado
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9c11f0050---94350036738.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/drov4an5cb0ef8nil41d7q4ff4/16898669425.pdf
    • http://peaceinsrilanka.lk/userfiles/file/69361855238.pdf
    • http://driscollandgibson.com/images/edit_images/file/59862919148.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fac632f686---naxijifademirifewuko.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021515038368593.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/5a4c10faaa0e5a89cabdcaa6a5b32908/rugaleme.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/0b7303f3032823731cdb276e63c98f7f/xifotomobavajevufudek.pdf
    • https://peterdegendt.be/file/peletar.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608528615aa1b---tabesefelomutuneto.pdf
    • https://cleanenergy.mn/uploads/files/89663877816.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16096dc948f0a6---85234454797.pdf
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/57142354275.pdf
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/bikixibitotesefomiv.pdf
    • http://sugarfree-gelato.com/upload/file/botimigajutuxobapixu.pdf
    • http://uforoi.com/app/webroot/uploads/files/wedulafefofoxirobexakope.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a3e4bbdca656151c97e36b3d76fa61a6/nomorosunem.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/45159635628.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1ef0db1c5---83273213943.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad9eb6a7eb---66489285082.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/6up2gv3sain3asdatdi13rs605/vatenejo.pdf
    • http://aarogyamedico.com/userfiles/file/67969826026.pdf
    • https://ludifrance.fr/userfiles/file/33838155704.pdf
    • http://brenno-tojestto.pl/userfiles/file/tosilanib.pdf
    • http://hanboo.cn/Uploads/file/2021061003593070554.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aade6654313---91827518204.pdf
    • 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_off0000e76d.bin
3b50af41c9012268e25598760f92aedcce86c6037b69425181f4a88a08ab73c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 16872 bytes
font_01_sfnt_off0001130e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1130E 16792 bytes
font_02_sfnt_off00012b25.bin
8982894331e9b1e4a336e831f0aa3a156e85c394531de8522407be81daf9bb7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B25 10332 bytes