Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e16572673db92e5…

MALICIOUS

PDF

81.8 KB Created: 2021-09-22 14:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2b90d9d77ca29ae0a032c40a5d6f9440 SHA-1: dc9e06ed4bd85189a13abe3c5b1cdb1436098720 SHA-256: 7e16572673db92e55ac70925639e8282831bf30b58d8d538b5d10ffcb04a3241
216 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. Heuristics indicate it functions as a link farm and employs a social-engineering lure to trick users into installing a browser extension or update. While no scripts were directly extracted, the nature of the lures and the embedded URLs suggest an attempt to download and execute a second-stage payload, likely involving JavaScript execution within the PDF context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://royalgoodviewresort.com/Uploads/file/paboredo.pdf In PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/a41ad3c70e98e3effc670882a08749e9/ramasodomutigu.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/pexukijidibegolexineluk.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/50133543595.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/konugadipopolosiforipi.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/60888864366.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///3931282849.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/35124784954.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/zobazovedoramuv.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/12503247168.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210902071831.pdfIn PDF document text
    • http://fitviewer.de/files/file/lukomasot.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/fagirafizafezex.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/81839532957.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/e5e3ebd2361c20cb8bb38979e791767c/91514825383.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/xotiremifedepige.pdfIn PDF document text
    • http://patroha.hu/file/48551538016.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/befb5f5c28ff2e1b8c11d6472c2f0f4f/29950083251.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2275c247f---vigog.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/74102457595.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/vutoro.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4e5d24b30a54d51e61a88b56e50710bc/10986126345.pdfIn PDF document text
    • http://ore-processing.ru/d/files/70718924034.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/86678122506.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/vq1bk3r88aa693jfj6degbqeg3/44907819463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+block+all+websites+except+one+on+chromePDF 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_off0000d91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 17960 bytes
SHA-256: 1fc92891fb8f2b7c72c1ffb9bc5884597f7b1e32b667827f9f8d28b1decda568
font_02_sfnt_off00011f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7D 11052 bytes
SHA-256: 34dc061e326a437b0fa0d8174b07effe143e65ff40f9c88a6bed7cfadffecb33