Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bc501121abaf0e…

MALICIOUS

PDF

88.4 KB Created: 2021-07-02 07:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6b2d734224bde2da3cfff59642f3c6d3 SHA-1: 71b5e0181e16e92459be246a3fa8a8a62d675181 SHA-256: 78bc501121abaf0e70ac47d78aac9fb119ecb0f6f5f4cd5b609cf17428702893
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. These links are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ba3a477f1---20672988719.pdf In PDF document text
    • http://ytlcases.com/userfiles/file/69834317608.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/15846246402.pdfIn PDF document text
    • https://tepihtrava.rs//files/97103059144.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/96320169376.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/gagixipodososufax.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/retabiririvoveri.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdfee4a227---50244914622.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/6416a8a01a22c80435eab388bb41e3ea/44552289128.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097f7b9a31cc---14276435250.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/81v28lmgsdnmb3mobv6s8qh928/21987621185.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/25691628810.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ec76caa9f---wibabukazitit.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cd4b5dd47---weparipidosuwudigid.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///bupaluw.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/79235879262.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607641d2d4709---fulerugepajekibenuso.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fe6536420---40064107856.pdfIn PDF document text
    • https://wecareprogram.org/images/file/75304652345.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/rivexonanuxupeluzefizedu.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ab8efea90f0---telabusatikopezapa.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/utrpvh1dqgsi38ubf8achl61dt/fifoferirololilasidi.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/bixalezojozipubumo.pdfIn PDF document text
    • http://hydrem.ru/images/file/zomofegevanaz.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092514f40562---62971119968.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c981dba0132---guselebodigokukizugepuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=clear+cough+in+throatPDF 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_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 10472 bytes
SHA-256: 9327e707d385b83fdaa428bb6cef07eed0579b49c8827a8bc784fac77c1a1f10
font_01_sfnt_off00010ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF3 16956 bytes
SHA-256: 4e9b523476ce7e43bb1daf608affe71c939bcaf008a22aab4514530d455605f6
font_02_sfnt_off00013c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1