Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeeac71975fb0bb6…

MALICIOUS

PDF

85.2 KB Created: 2021-09-11 13:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 442e2aab528075c8a5c3b2b83be8f597 SHA-1: c54292b189b66e2d9ebb426a98dd25ff71b41e3b SHA-256: eeeac71975fb0bb6e3350c9fea2809d462aaf5ce78a4f54c31769e73f3b5f01a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, including one on a compromised WordPress site. The presence of numerous links on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://queure.ru/uplcv?utm_term=defense+zone+2+hd+lite PDF link annotation
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f45f3c3bc---zujagazofonuj.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/6757256645.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/75987686807.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/11173008035.pdfIn PDF document text
    • https://pmms-online.com/assets/file/50463115855.pdfIn PDF document text
    • https://beaszemin.com/files/60964402927.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/29454161911.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/29915404581.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/44831522346.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/73079220275.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/11362368551.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/pabusikamaragezogox.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/34928127635.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/72415710045.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/60991476417.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/88696077487.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354fee3a4bc---tiwoxatoduzigug.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161384d511dd9a---21550682517.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/texukolozakurufizos.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/76070428553.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/tejebevumususoduge.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/pazoxit.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/25875694106.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/52141152834.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/jotorobasagosilapufavane.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/7738004658.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b2be0af1218c46f9b21f784f279ad9ec/26207005556.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_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 10368 bytes
SHA-256: 31a421943f6d0c5a3d1d59738b026d8c49839013237661c52ee3d5b346b3135c
font_01_sfnt_off0001011c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001192e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192E 17352 bytes
SHA-256: 77639a6d89495ea6199caf75aad748d5ae9cf1cfbe2d2c0fa12700fd970151d5

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