Malicious PDF — malware analysis report

Static analysis result for SHA-256 978f26aaa22e961f…

MALICIOUS

PDF

101.1 KB Created: 2021-09-06 11:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0e1ea704f31bb5e7339c62c3b5a1daf5 SHA-1: 95def932f56f3506c5d6b69dbd3912c1ba26cb99 SHA-256: 978f26aaa22e961f3a69b0c8e3bb3e45abe08f7fa816c98f498d565f52edadb8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://agrobud.net/uploaded/file/donuvuburad.pdf In PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/lofisexenomezadebafonudu.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/63694304184.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607723a6aadac---70700332501.pdfIn PDF document text
    • https://asi-filter.pl/files/file/53528061398.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7313bbab3---28060045700.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/32362429618.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/d5a9ecaaf6f858583e64b8a126cd275b/70055318768.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/zaxopilolisuxibazuruseviv.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/xewis.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b083a071f0b---70301789091.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/20ebab504b6333b56c1facc1e5d535a0/lajunozawasab.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd75f9697d---ganifokuwiseselisifejem.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160865b226507a---8447589736.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/ledegozezatusu.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/42794621079.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a8c13c569ce661e20aeb443c34139f1/rogarovajomekadowebuz.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfec70aa82.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/8168d131959854a986a134270ab87fbd/57072027419.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/27600892685.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608292e798eb7---lafokozemazarodif.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/liluvenujukurajuditek.pdfIn PDF document text
    • http://polipack.ru/content/file/59559101269.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608269e7c9635---moferajeridor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=psr-290+keyboard+manualPDF 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_off00011f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13770 20488 bytes
SHA-256: 9ce7e8d7271673ede7f809360db60717c2421ad60d3d3078942de9d7179946ae
font_02_sfnt_off00016ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CE2 11112 bytes
SHA-256: 1b9122a705c54eecdff0336142303194e36263bef369802badec74ec47a84489

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