Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d1be1385db6c50…

MALICIOUS

PDF

84.8 KB Created: 2021-08-26 23:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 18245e83ab576d7daeecd15aee9c70f8 SHA-1: 786ae790a14f8d472fa0e7d93315dafd0fd7eb18 SHA-256: f2d1be1385db6c50b62a6c6cc1f1f856de32c8934f62898b9d0c7bb6e3368f70
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and numerous external links, many hosted on potentially compromised CMS uploads, support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://binarbaidtrading.com/public_html/userfiles/file/tanilixazawebot.pdf In PDF document text
    • http://rogalafamilyreunion.org/clients/0/0d/0db8e8e54aa701f14f52e26b989c21c2/File/12271763456.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/7cd8e2aece8f53f1ba361c2e6a98a54f/dafiximegatekolobowowu.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3d5a3cde2---2038613474.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c708c4c7dd7---kefubamosufoduviremuvesa.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/4e9b2be6be91490121f3d9913d0ed057/bibojulugido.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/zoxawipumopilatemuzigubox.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/55607487236.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/9bb5a37d9e326b667eb1c1aa90e73ac7/21070470339.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cafd6f7a51a---37724428140.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/r7k4ugs6puuuff5q1a54dnq1ta/rugularobisilumuxupimevov.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce488d22321---jafukejopafikuwigo.pdfIn PDF document text
    • http://chinahongji.com/d/files/nogejikuwisufet.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/0dddcb4d64b43f11484127cf586bb783/3840330634.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/wisabasajivorowoku.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/16463583892.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f89a869f14---85482412046.pdfIn PDF document text
    • https://actorconseil.com/files/file/zomukafeziw.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/14728878829.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/vuwilibilaw.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5325b5fa19279305d9207e315a51cec3/87125334277.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/gadat.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97633173613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=carbon+steel+pipe+schedule+chart+pdfPDF 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_off0000e7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 16660 bytes
SHA-256: b54da3ee1fdd5f56599b98f5a1d7a378e137c07f4dbc8cefbb8b1220d3af2a14
font_02_sfnt_off00012b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B52 10988 bytes
SHA-256: 8659896fffdbc0534f1f81b945946e1117f3bfe10dbd454202cf14ac222eb4a8

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