Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16e803daa2712cc…

MALICIOUS

PDF

123.5 KB Created: 2021-09-01 21:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cadb1e9ffb8a16ff15475a85a89d9687 SHA-1: 746a0fea514767e0f41ff40b3d764626b394d7e9 SHA-256: b16e803daa2712cc96344463ae9774a70d305d9c11345398f0b58830352a283a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malware or facilitate phishing. The presence of embedded URLs and the nature of the link farm indicate a likely intent to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://pistant.ru/uplcv?utm_term=sims+4+city+living+download+free PDF link annotation
    • http://phunggia.biz/userfiles/file/rutuzisujavuwozolu.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/29878073671.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a3a9267bed5ef5e33405c8c188f119cf/41559407459.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d483b44bb1b---ruxefiwaxip.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/bajok.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/f65e80f8cd95514de591921f69ed3bfe/segoxokitukixif.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/30663183173.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7bda03ce704d07c082f64e3b150e6200/sanozirop.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade67907626---69635271962.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/67605621520.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f09d9653c2b0e061c46f8843f308b47b/86237881501.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/11905583019.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/92299763345.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/sipivoz.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/dixulagu.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a206afddf3f---28444576347.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106070431.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124b13b31016---jugoradulumozu.pdfIn PDF document text
    • https://soechi.net/userfiles/file/45688853218.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/dapevavilunarasesazibem.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/nugetapavixemoxaxenas.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/wabumakunixizomini.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c1cb631d09c44e9cfef986d85a3c8ef2/9879364907.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/07/file/202107052335302015.pdfIn PDF document text
    • https://bem-sa.com/img/file/95367519345.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_off00017773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17773 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F85 20348 bytes
SHA-256: dd2b10e0d66a9d1671db2e736c436a4bb8d943680b93bb220554286785ee8c63
font_02_sfnt_off0001c4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4CA 11236 bytes
SHA-256: 561c0bcb80c9b2b473a29b305c23bc3729a4819dde326d5cee5eb507aabc2cf9

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