Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f736209f328769…

MALICIOUS

PDF

88.4 KB Created: 2021-06-27 05:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0781c1b3c0e1ad0f06cd7ba0323d4cc SHA-1: bb9e7110c3d2eb8456aeda2c7eb34faa6e2a1a51 SHA-256: f1f736209f328769a7ad95c5e4e6d78fee7c54e9f116971258ac1f1dae2dcf0d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress installations or disposable hosting. This suggests the document is designed to lure users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://eyetracking.pl/userfiles/file/47349475061.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/bbce2a8cd0d0da01ef46ef948926e8f1/5234738066.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/eaf11fcd875b66cb8ab50d8ffdb78129/80900527042.pdf
    • http://fsoa.cn/userfiles/file/vanefijibutaroki.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddb20c7d95---15489614446.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5ccd849a0---54008358157.pdf
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/repizagutomanana.pdf
    • http://zhengfutz.com/v15/Upload/file/202162012941748.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/58s604e5qsvkrof5d0v4jel0c6/77291036288.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ac138fc0e---buwazeja.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f62221ff2f---gafip.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/6dff56a037197ec1be244318cc63c48b/nuvofuwuv.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0e0d98a5f---zunosorijoxebur.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/64029780484.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a44fc396488---gegumufutugupeso.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce84eeee05b---6490069099.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8823e9db2---73886639229.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ba754be2997---30457465200.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d2853348e---mebadesekakolekereven.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/9692gp8195tf5p4vho11avd18n/83822449538.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/91bbc6b78e88ea45f9cfd736c56cb187/9334507485.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/8f3df55ce604ef14a2f7735e39d7c151/63665715455.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=on+the+12th+date+of+christmas+2020
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f416.bin
08216b62d27c935a035c30ccd35ffdf04de4e03d06d066b57c35c7ea3d18c65b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 11012 bytes
font_01_sfnt_off00010d9f.bin
66825927a9e5db4aa2111bd6dde94990ae4f498220b5c603d3d9b60e36826c12
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9F 17944 bytes
font_02_sfnt_off00013c3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3B 16792 bytes