Malicious PDF — malware analysis report

Static analysis result for SHA-256 358def56cada8508…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 22:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f76fba661543c3f05c5c0f15c9d9dfee SHA-1: 4f033922f8385c0a8d8b17baf128fb7faf4cbd65 SHA-256: 358def56cada8508a36cef7fa6b5c08864da1a6cc016280be03d0a84558b3d40
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 0.9951

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
  • 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 http://papaicountrylodge-longstay.com/user_img/files/34763664909.pdf In PDF document text
    • http://magooferta.pl/uploads/fck/file/38601975987.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/25244386443.pdfIn PDF document text
    • http://world-system-packet.com/userfiles/file/36350507032.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/5c4fc84d258e215c7685d6f6e1ee1aae/peneninowezejov.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202108150736162816.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/4fbb67dbe544e6ca43f033da24b5ba8b/37383591866.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/3b1e6570605a3e0b2fc0c55453846e8d/juzarosenu.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/lerimivafulalufimometaso.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2066212a882626969a70ef8e149ae65a/89791432383.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ecc5d0f55bfdaccfda077238c594ce89/nakuwa.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/349ae4f00959cd5ca7fd65871d8478da/94916476976.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-2/20210502204600370929.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/rubaxelometami.pdfIn PDF document text
    • https://clinicscrm.com/img/files/vudozogakovara.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/55388284359.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5bc2a1d2d---guvejuzulid.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/xulatipalafeteriga.pdfIn PDF document text
    • http://thaide.org/userfiles/file/9575898917.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/tubefuluwej.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/14237598243.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae435638f2e---wobozoxan.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f917522b07e11481bac6358a0e86271f/legazuvogirenubexa.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/754930069f388bd9e638841ce908dcb4/96140230406.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f77debf88f---18635465960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=financial+management+prasanna+chandra+pdf+downloadPDF link annotation
    • 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_off0000dc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1B 18012 bytes
SHA-256: 61de9d22bfd9117deae4bf3a66a34de350e112c58bfc8dfc0f6aeb846cc92341
font_01_sfnt_off00010ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC2 11132 bytes
SHA-256: a6029b5c211c5de99e70c3e54878cfa36400dc1ff48ae9fc51cc1d163cd6da8e
font_02_sfnt_off0001245d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1