Malicious PDF — malware analysis report

Static analysis result for SHA-256 7893ef275a04b567…

MALICIOUS

PDF

71.6 KB Created: 2021-09-10 04:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ef2d72ecca7977c641297c4faf1b3de6 SHA-1: b35db7cad5a37916cb1c4a4ea3d5e7076baf3eaf SHA-256: 7893ef275a04b567b154a1ec3c57f192556a8f0d205a6ce6c9c77ceb6441ed00
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as phishing or a trojan. The presence of multiple external URIs and link farms strongly suggests an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=keepass+google+drive PDF link annotation
    • http://bdsps.org/slbdavbatala/userfiles/file/69212776032.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/73955745673.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613a33573e9a8---12439906976.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/8af7dc4b5c25885811215650f5b6a44e/gezugawi.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/89831802845.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/bokoxikeke.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/18504846390.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/zitevufabi.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/47198164886.pdfIn PDF document text
    • http://jinyezi.cn/upload/51405059940.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/nabarovafotavazoxig.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/89745070023.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/lafuzogovi.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/160ec1a69ad9f9f7451a43de14f9be65/sizutefamurufilijeze.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/82543356491.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/35200933002.pdfIn PDF document text
    • http://flomojapan.com/upload/files/25056795195.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/pebuvukesudusetus.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f47dbde7a8---40837999080.pdfIn PDF document text
    • https://topupdana.com/contents/files/69242015630.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/pagekuwanorinanaragore.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/ludutozewebomanufa.pdfIn PDF document text
    • https://webrobogo.hu/kepek/bezekituku.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_off0000b856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB856 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06D 10424 bytes
SHA-256: f3de9e713b08d7c2e6121d64a2dd44e8a93108bc1c0455a9936d468436626fb8
font_02_sfnt_off0000e7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F3 15960 bytes
SHA-256: 3a78b3a834150c33fc6a4c189e7d2d0d9ea79b557f67b0119dd0e28e3d596d63

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