Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9af89ba035c4d2d…

MALICIOUS

PDF

78.1 KB Created: 2021-07-26 22:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 86c410349edc6864f7bb8f6827fd540b SHA-1: 02df3af2c36e4675186192f304511d8ca69a34d2 SHA-256: e9af89ba035c4d2d5f5bed64443d8acfa17903aabdaf9dfc9085b54a0363a267
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm hosted on compromised WordPress sites. The embedded URLs, such as http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079426b7e2ea---guropibenu.pdf, are likely used to redirect users to malicious or phishing content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e1e5dffe0---pijiviboxabisojibuziv.pdf In PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ung7g1cfturvv35puc57e9lrha/11849222515.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/48787854505.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/64782928663.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/96209605526.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/59b6dc746b603eda96b4104f1af8e251/73155121855.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/gejedigulitoxa.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/najizejedizenimulexaxur.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/47dd99f5a85d65584ac1da6bec406f98/kelenadi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1f4bb8a7a---xumagafulaze.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e9da1e6fbb2d13bc2db4a43946485152/22555522864.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/10c5b1db04c1c04e2d64b75b355dd73d/36363649475.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/15256479933.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079426b7e2ea---guropibenu.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/78318411143.pdfIn PDF document text
    • http://birminghamseaholmclass63.com/clients/75362/File/24155712602.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/5bhaavc5p8n5g85sioo53fovjv/50835103611.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26278785772.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/c3d7a5d7aab1290766163fafc3904239/27046024819.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/50661761496.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/5fe1f454aa7837b4d68337e5582ac8c8/vuzofalabuzegokudebesixe.pdfIn PDF document text
    • http://kaies.cn/upfiles/210602122241364969anwpgl.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a511384fb1cf9f87579d39ca694afa17/kiwixoximavuvexaxe.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/zepifalotawifixanagozifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=principles+of+accounting+2+exam+1PDF 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_off0000cb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 16936 bytes
SHA-256: 1b90af2231a30821dbf8866b2ff39a428154f55398e434f344c6bbf1b4a06fd5
font_02_sfnt_off00010fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB2 11196 bytes
SHA-256: 914ad0d5b0985e67e31b9845b6a8c3a72143d78c7607e176983b2868b0993c4e

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