Malicious PDF — malware analysis report

Static analysis result for SHA-256 c062e7d882d707c8…

MALICIOUS

PDF

84.0 KB Created: 2021-09-08 04:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a07159e9731cdf8e8dc6bfa7b987f39b SHA-1: 9754852b3600e82f055e5cc7b9b846d5917eb686 SHA-256: c062e7d882d707c8dbe148feb546ef402daf7790c64270c0e652df601ed050dc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The embedded URLs and link farm structure suggest an attempt to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://mtjjt.com/2013/upload/article/files/210806121116685195cmacg.pdf In PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/447c382eb09833f025616e470cd68549/jipugefek.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/12400970111.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/13437204009.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210902185501_412851214.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8a2587da21542646da5ffbab815b264d/rorijirafumupofu.pdfIn PDF document text
    • https://ayurmitra.com/files/file/vodan.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e77bab0911---176964123.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b92f1542258---90714030232.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/76713583027.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/16286728798.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/fularigolixopegajudenowu.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/254c62f5089ae90beeafa70b3fc0a36b/99360025331.pdfIn PDF document text
    • http://tochalco.com/uploads/files/pogivizurovosaf.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/69928977118.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/benasazilegewexoku.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/47768397167.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/d81e1436b2896277ab0a149b22ec5ff6/vifiton.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/16234811380.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/govofujetomakizemo.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/49790805628.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607392122c941---63012053180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=biceps+tendonitis+treatment+pdfPDF 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_off0000e123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE123 18388 bytes
SHA-256: 3675480809c0ca2d952121707b09b6ba74a96032c22f0f0aeaab689e75a3455c
font_01_sfnt_off0001114a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114A 10788 bytes
SHA-256: 654d510a56e2fda2df2870a14656cf285a46d52a4e6221cffd38f9f3d141cff2
font_02_sfnt_off00012a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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