Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e2a659b900a204…

MALICIOUS

PDF

96.5 KB Created: 2021-08-09 13:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 66fcd7f81a4cad1193b2874408ae2b9b SHA-1: 5e47e372265adf7f0ea11f1d55ae7671d67c62ed SHA-256: 81e2a659b900a204942d4e118bea2840cbbfd4f93b7c1714fb58abcb0a001d13
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://smidgel.ru/uplcv?utm_term=how+to+get+free+gems+on+cooking+fever+2020+ipad PDF link annotation
    • http://www.anclupnapoli.it/userfiles/file/21485290123.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5039a4aa515950fa05e512649db767a0/tovofijobasagepuzujixipuw.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/jufalebupubo.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/16613371357.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/74456757517.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/batuvelibofuwo.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/kapobovetuzaxosejara.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/tuzusa.pdfIn PDF document text
    • http://shs67classreunion.com/clients/b/bf/bf9552935413f2527bbee995f2dfc9b5/File/66230622907.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/jozexin.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/zapodakoxolumukudupubudi.pdfIn PDF document text
    • https://chp-travel.ir/data/file/sixizanonidikesawum.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/8de21267d808e636e12b31db96649219/24895485421.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/mv2n7ld0hpam7lmo0smc6jdoo3/35952085447.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/zetevusosixib.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/38235144836.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/960db27a2eb4e59a6315b16833597bf9/bovenoburesejosim.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/95347889877.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89cb216d49---zesiduwakiwegujokeb.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c904e33d0e5---vepurepotuson.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8fee02058---garonunekotak.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c83fe3247---93722416224.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/n8brsgu2rm3s9u2db8jnk907ii/14925756826.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210528142535.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/lupaveti.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/uhb628r2dv70n4n189bv6p5jq5/burixazoduruvuxe.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_off000110a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A0 11396 bytes
SHA-256: c4ac6a6cfa97da08702e6140c2ce62d18ae1534468c42a5ae2366d18545a4c89
font_01_sfnt_off00012b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14377 18200 bytes
SHA-256: c93bb55ef6c5a12d33e4990a4f26a31ff0d04b6e0f842344b3799c02e5362960

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