Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1ed9712ec92404…

MALICIOUS

PDF

78.7 KB Created: 2021-08-18 13:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0baedba137dd4042c53d7ce7fdba99a2 SHA-1: 955e82b54d995a9a6e22d85aac74efbb022c858b SHA-256: db1ed9712ec924049726c5cbdc74fd50760348ad8227d07b03f0bafc66b1462f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document's primary purpose is to redirect users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.bandungmesin.com/file/rexexasuwibexalepe.pdf
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210731_B021387C4EE24D79.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/n666c70mf24o2eatbgtq62cmj4/62986954055.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/b25dd069b3e31bd7494dc0b3636ab5e6/27058732269.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d896ba258d---dotez.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160804bf9e93bb---nezefok.pdf
    • http://manpukulivermore.com/uploads/files/fuputi.pdf
    • https://behagi.eus/files/galeria/files/12388899157.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/2d0163168528aa7c06a5111e40e35af6/gavoj.pdf
    • http://say-international.eu/userfiles/file/gopizagune.pdf
    • https://groupburuemas1.com/contents//files/27571531677.pdf
    • http://www.blueoak.fr/image/file/86719822200.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/d0c547d251f63693ebdad956d14b56f8/74144442868.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dea9cd49d1c---baliwowimusinesisoz.pdf
    • https://mediaget.ru/userfiles/files/14978502683.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/86833b1da7fb5cdddcc3844e33ce0edb/35474010734.pdf
    • http://rc-mst.com/mst/_upload/files/14931299163.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/48b05659401a9a001b0d06ebd7f159b2/nutidodaruwiwemaborolu.pdf
    • https://its-bulgaria.bg/files/file/61703632709.pdf
    • http://www.anclupnapoli.it/userfiles/file/fotevegaviditogos.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/dmo2bik001r6nlupcklr29b01v/kuvigofusetuvak.pdf
    • https://tanasiri.com/piceditor/file/mumepamebogodenosuga.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ad0d36587ae35239d640d8a808a972d0/davimuzewoloxekulajegu.pdf
    • http://showplus.ae/userfiles/files/xetetirewifuxugod.pdf
    • http://ratchadatitan.com/UserFiles/File/ruvalapujuzugi.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f432497494---nabimuz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=amazon+kindle+software+version
    • 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_off0000d02b.bin
6e57206a1d31e212479b8ea64e72dc50afe170d0bacf5add87e63a2584ff1dae
pdf-font-stream PDF embedded font (sfnt) at offset 0xD02B 10800 bytes
font_01_sfnt_off0000e927.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE927 16792 bytes
font_02_sfnt_off00010139.bin
924f1e57ecf3185c59c0ddf32f6defa20d66b75a6d39605782b66ed27135f396
pdf-font-stream PDF embedded font (sfnt) at offset 0x10139 16776 bytes