Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf45a7e3f037d081…

MALICIOUS

PDF

87.2 KB Created: 2021-08-12 21:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 2a6f766015e7a9eaa7a9300d8a13f230 SHA-1: b3592f20152a26147b5f5d4cda0f0d6b2d0b1a73 SHA-256: cf45a7e3f037d081da0da08e76d09099d37596f8a336ad8a65609747f57ff698
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous links pointing to compromised CMS upload directories and a visual download button suggests a phishing or malware distribution scheme. The file's structure and link farm characteristics are consistent with a campaign aiming to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6064c6da6b---fufubu.pdf In PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160846767d2fdd---kerowovomadowereb.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/51055a4e8c2d8b6736c45aa699f02672/bevivo.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/a28017f99d27f010ad6cb05b7efa7f0f/68345440291.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/xijur.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e56770585---23139249377.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c4bb5f4d9---jogikofaxumovatiwe.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/72364518041.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/34764646405.pdfIn PDF document text
    • https://majubesar.org/contents//files/pulilosokuvineruwepuk.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/0c9751d33df11d21caed2e6021c6df00/38132197314.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d24f5caefcc---69017382323.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/8365922359.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db45600bcc2---16300077435.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/wegexozotunusefapozo.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/b72db95827bbdee43d663d4b4c7b51a6/77566402083.pdfIn PDF document text
    • http://potlista.com/file/files/9216835120.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/o8kar9j95m4mg98ipe93h7qk95/gizalopigev.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/wafebifepu.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/94301344884.pdfIn PDF document text
    • http://wecareprogram.org/images/file/43334450395.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/66034287576.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/puwexunon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=8th+grade+math+worksheets+printable+freePDF 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_off0000ee71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 11372 bytes
SHA-256: 25ca81b4aae77d6e34deec3e6a70bfb569a3a76b7fe26843810f6a2bde8e6cfb
font_01_sfnt_off000108b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 17284 bytes
SHA-256: cea431792c2503179dd5889e7cf6821c2df28462aab984992edbd7b3b87a84e6
font_02_sfnt_off000135f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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