Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b921d99d9b4aec2…

MALICIOUS

PDF

214.4 KB Created: 2021-06-26 00:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2a8ddd1a83355456d6ae0a751f0d860c SHA-1: fd5a6367b8e43313782df0fef5d2e61251f91075 SHA-256: 9b921d99d9b4aec291d3e4d8439239c3f041222bd6314a0aa1976a6d913f8001
166 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning model, indicating a high likelihood of malicious intent. The presence of link farm heuristics and SEO redirector firings suggests the document is designed to lure users to compromised websites, likely for phishing or to download further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards exploitation techniques that could lead to client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9783

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/676dc53b7bdb2fc7d1acbb5249a9e1dc/sefaxopubuwotesumumunom.pdf In PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/gu8pj339v3tm35js266595n8nk/77898435105.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/3413457483.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/jivul.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f27af42a1e---totumik.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d15027e87e0fc2d3392e7c8b8c9829a2/96012487145.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/c6ebf30728f3030361fa6499808bae87/30845990195.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b41dbb6158e---38496009349.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160822b0bbce5a---zepalotelosovemawofugila.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/nisunopikek.pdfIn PDF document text
    • http://azizolace.cz/images/file/sivodaponasolapexagivaje.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160909168320f0---bamonusijulo.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714e6945efb---logenakunupobez.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074414610095---68159376082.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab64e28150---48563660956.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a413b90d778---vaguvikaragotal.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/situdideduzanodis.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/dupijegafubor.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/06/files/210612110423.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16088a6d969900---75334512684.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/saruverenisetog.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c9faa602e8d---voruvirosobuxawujeni.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/71172102129.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e1ffa3832---bevifasosuwukovogobapat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=synyster+gates+2010PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002ebb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EBB6 10508 bytes
SHA-256: 86815edaa510e6aa368f2203d2aacc8e0d8bcfd63a40436d6c629912d5447e4d
font_01_sfnt_off000303e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x303E9 18016 bytes
SHA-256: 608bedb4fe6ca396563a947c5b0cce23f6b678b7d2fa1df47e8a9aa883769026
font_02_sfnt_off00033325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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