Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3b05b7ee59129d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-24 00:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 56b65a20942b05e093fb60dffe8b5031 SHA-1: 68382838e03edbec85b9bbe953177c339a8cd17a SHA-256: 4a3b05b7ee59129d2da0e2405b714b2dd275754347100f210be34a3451f666f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of multiple external URIs, including those hosted on compromised CMS uploads, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/aadfee7f0b21b71539a6bef5abd0eca1/6146456385.pdf In PDF document text
    • http://chuanghuilaw.com/filespath/files/20210907205113.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/45829680880.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/16617149157.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/dezada.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/7913451101.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa798d574d---52798189809.pdfIn PDF document text
    • http://merwepizza.com/upload/file/tanox.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/47g0e3hvb9vq364lf9uii7dguc/difudebovewobozixozuto.pdfIn PDF document text
    • https://zhansq.cn/upload/file/43151857332.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/21040592066.pdfIn PDF document text
    • http://alidongdong.coco1490.com/upload/file_folder/file/69623155488.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/bivivo.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/92503954538.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/94493922448.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/89157484248.pdfIn PDF document text
    • http://kisito.com/userfiles/file/tagoj.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///tokisenudenobototun.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/dugofafogisomedajope.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/livapujane.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/86369906164.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/11373768991.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/fegulabilowunakarorubut.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161394d902f0b6---mebolobokegapejisidu.pdfIn PDF document text
    • http://tid.vn/upload/files/12965828489.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210918_71C0B371742DF669.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/25261908770.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bfc279f68---95057359900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=iphone+vs+android+differencesPDF 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_off0000d97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97E 10592 bytes
SHA-256: 2460188d67847224420ff7540b62f2e42555da9e77be79b01c15b7f16db440af
font_01_sfnt_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 17656 bytes
SHA-256: b28ab1d9cd7ad7b03b306f44f87834cfcc7b8e4c064760957c81028f6a4ec7d9
font_02_sfnt_off00011fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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