Malicious PDF — malware analysis report

Static analysis result for SHA-256 1796c7217c76ba7a…

MALICIOUS

PDF

91.6 KB Created: 2021-07-29 17:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fd988b0a9d44d1cdd59f989aa0ead53a SHA-1: a08590576fea25e4213d3212eb3b56b0625cb2b0 SHA-256: 1796c7217c76ba7af87e6b599d0dbcb7f47997da89afba68918cdff8acabe5b2
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=how+to+mod+minecraft+windows+10+edition PDF link annotation
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083956a248e2---xevezigesage.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a677426f523---38054617723.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160877fb0ad2d3---7687567632.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/fiseguj.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/fk00i2i67mhg9m0k5ajv9e5d3s/54310853111.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/7lgfl48m34l5372e5sk32ksjej/44737247946.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/zikejemevubizobodas.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/wadamanelomizexexa.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/60b4d02605159d014d4d19af0be62fed/bixesogenekev.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/7acfcc554a3b0de55ff31ae6f1335923/82162160830.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609dffdabeed8---riborulike.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9d0a37c87---52095430986.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/nomajugo.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/23253459062.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/87129349566.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/56799419369.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/60763795437.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/3137615477.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/93080161308.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/vukitogusiwavikezili.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/gelazijufumubumemike.pdfIn PDF document text
    • https://anfauglir.com/images/file/5664488402.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e1ca39b01---delagomax.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/86c33d69c3507815cbfbf0a9e0b589b4/pazixupetoderabalelezi.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/lafimujakila.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084232b8e200---8675004190.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608450f735b9d---tepaputijejubarutixix.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001003b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11852 10844 bytes
SHA-256: b65b3ad8711865f6aa0e258df57f394e04ec9bfdd65a97e66d862b0344e9ba68
font_02_sfnt_off0001315d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315D 17660 bytes
SHA-256: e769f28c945cf229e2504814bd515f7b1afafc1fc51fbc1dd7dc69477b87dbc2