Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2c95542f40b1ef…

MALICIOUS

PDF

79.4 KB Created: 2021-09-08 04:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f4fa88b8d79dc9d506b5f609b7818d8 SHA-1: 03107e22652933cfdfed9cf2b0d503b5310f8700 SHA-256: dd2c95542f40b1eff5c59e087f3b5b63a31080739765af6a7ca55cf097430060
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm or phishing lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing text but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=air+suspension+design+book+pdf PDF link annotation
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6c83591c1---muvokugejum.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cbb0e5d77---37076449935.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/8dd522d5b385a31c4fe4e6824501a2f3/86484025477.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/nivusudokifetovujufi.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/valijiw.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/23214992675.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/9d6ksmg3or90aq4o6ad1mqqss3/96863100349.pdfIn PDF document text
    • http://195exim.com/datas/files/66399405519.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/32747059624.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d673bd1115---28525737771.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/16855887517.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160766fbba9c4e---71174170674.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/1683790151.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/45393743845.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/mv1idvaf069a7mimka5l4g4i32/zoxapo.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/viduvinu.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/xawaluzukaxuse.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/0s7j2sjl0k1jhfbge2n2rj9pte/44880564341.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5b984a13b545aca6a4f1806f5a86230d/joxifigelobudazibusijotuz.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/38898825138.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/01c40b603920a7af3f35e587d5ee9f65/foguw.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/dafodunesekelubovotex.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/kukirowetisi.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/28493245563.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD660 22300 bytes
SHA-256: 0eed1cb6638d64eb7e8e4eff92367df794093419010e4ce6d78ecaae3a37fd54
font_02_sfnt_off00010ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 10680 bytes
SHA-256: bb398bcfb17136dc5e04e1031e098bf6306b7cdfe0313117e3946d52a18b614c
font_03_sfnt_off000126eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EB 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c

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