Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ad25e0ce6cfd34…

MALICIOUS

PDF

69.0 KB Created: 2021-10-01 00:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d0806389fa21160a4190c487ade1de0 SHA-1: 2300f2d5f0d51ae0299b0e76734de63a55bc2de3 SHA-256: b3ad25e0ce6cfd34b8e76297b2d344bdb201f33dbfc87e1c9b73ab9303b79562
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress uploads or disposable domains, indicating a phishing or malware distribution attempt. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farm characteristics strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://eunlocker.com/Images/Editor/file/miwenuxivametebidi.pdf In PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/81239893611.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/ioacopdqnflpfrnca2dlsciqh4fu5sts/86004027187.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/kanatefesunidabolidu.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67bd3c36ef3ccf36e42a0a7f18e55ee4/45310511730.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/63183157000.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/daboforurukereravagaziz.pdfIn PDF document text
    • http://someteme.com/archivos/_20210924182707.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/12392306130.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/10316667314.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/nawifadipokekizugovaliv.pdfIn PDF document text
    • http://asja.ua/userfiles/file/vulejafosakezatovopafaxa.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb061c1011---koribikisadapazumujumov.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9f02d518eacc8e083cb303a528f3cd47/fefuxakoxovuwavifezar.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/nubewapazivebixixobiwa.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/jifogiresivodota.pdfIn PDF document text
    • http://topstec.com/d/files/67523537949.pdfIn PDF document text
    • http://totoumi.jp/upload/file/66539273098.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/xalajodedis.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/51415718907.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/tovaxes.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/riguzopupofidukar.pdfIn PDF document text
    • http://apple888.vn/luutru/files/63006868086.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/69118304149.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/zijorirujizofoxivuso.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/74897188544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+android+task+killerPDF 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_off0000b296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB296 14660 bytes
SHA-256: 31df5230166853fb4a59aab94a8191edc40becf744699082c0094bb1fd8cefc2
font_01_sfnt_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 10388 bytes
SHA-256: cb530e7e44591888cabd46d8e614cad9937b4be43c24e7c19be09a8331632671

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