Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe9f5c023cb9935…

MALICIOUS

PDF

84.0 KB Created: 2021-09-08 10:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 157472aea48869e02e5e11fea4c48dd6 SHA-1: 175d2a6d20e3c7d9a1f56c99e16eb22ff0d20347 SHA-256: dfe9f5c023cb9935c2c659e7d2b5be87f28d116e67621c0bba93e0cec0db9e21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db61dd1f28---89561265001.pdf In PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/28494548163.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/006de64ba829573c6e2e1fdbaebdf77b/kakenasasuf.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dae7d5c122---31497069312.pdfIn PDF document text
    • http://wernitznigg.at/files/ludizuleviduletifadenuzol.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/1274081386.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/vudebujukogu.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/vomofalena.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/bo94rodp703rhc4jplqkth16v3/joforoxonozuvidawunudorob.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1d514654c1983562631390028719d605/74315877409.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/49540684236.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/duxixulilopugu.pdfIn PDF document text
    • http://vodnik48.ru/content/file/kutejazeneruvazemad.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ff79779f9ce---16763729395.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/5275334876.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/743iml128kin1g5vcal5ah88f2/guwuzekonawedagoz.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f508daabf95---xulawesojelilonujarenu.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/4299136231.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077c0ef1bd18---lurovofaputifozure.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/epahuvqfbuce4erj7vogpuomlp/73417192595.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/84597986385.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-1/20210501072138364129.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/vonosanonojanebogomofelul.pdfIn PDF document text
    • http://jcaf.or.kr/ckfinder/userfiles/files/72150827065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=oracle+awr+report+analysis+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613797fec5afd---duxojug.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_off0000e2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A3 17824 bytes
SHA-256: a734a4d67d89634d73bd89b424a5799cfb22ed83313c3e8e129da46d2d64bb65
font_01_sfnt_off00011118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001292f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292F 10840 bytes
SHA-256: a58c4f9d54365315f5908c0485c04e13135d7ec8ba349e142ed93c3ff53ed89d