Malicious PDF — malware analysis report

Static analysis result for SHA-256 c073bc7b2c971145…

MALICIOUS

PDF

91.6 KB Created: 2021-06-29 03:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e4794754e33f54bcc4c2f57ccf1217ec SHA-1: 648e15c1c05187601af84dc21651a993f1888892 SHA-256: c073bc7b2c971145d34f44f60a6ea8e1683fc1abe466297a13e33bbee12a49cb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1553.004 Security Software Installation Disablement

This PDF file was flagged by ClamAV as a phishing trojan. It contains multiple external URLs, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The heuristic 'SE_SECURITY_BYPASS' indicates the document likely instructs the user to disable security software, a common tactic in phishing and malware delivery. No scripts were extracted, but the overall structure and heuristics point towards a malicious document intended to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://huntic.ru/uplcv?utm_term=how+to+get+gems+in+monster+legends+for+free PDF link annotation
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/9k2c66eo8j3f6dch9ob2hqgt9j/81758276055.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e6f4418f3---ruvonurugib.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1b2021a8f---10035231737.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ru6g73d67rggssie9mi38mqtr6/wabixumigojimanadositegu.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f39a244763---23608778633.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/00938c1769676db77cf13bfde85b3052/pekiror.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/pomifodup.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/l4dmk1ea394ofgl0otpc3eodu4/zukinopamuruso.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd01ad27fef---52283698116.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160895ce16f16a---69299721867.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/vitedu.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b139bdba9218850e1a7f03bed3844828/gemoretom.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a509c4bcef4---90271368016.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/63470078488.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/95137459145.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/lokusukusexud.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/m10pbrcb2tfodsh73aqvh4hk45/98200645150.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b1bfb4ff2---liranalijufapekoseduzavo.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/61588351782.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/49133968832.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/fedajigirawinumi.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3696030f2---68780319945.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_off00010265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 17740 bytes
SHA-256: 29678e93fdf361b4b588d0c1c6fa62883303a06e7f84ab660877685f18bfb9b5
font_01_sfnt_off000130ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CE 10612 bytes
SHA-256: 63dcdd96bc17a99dddb9fdb89c700eb46770089a19da1537585114baf7c097b3
font_02_sfnt_off000148d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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