Malicious PDF — malware analysis report

Static analysis result for SHA-256 063c794b56b349e1…

MALICIOUS

PDF

86.2 KB Created: 2021-07-08 00:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ad625bf6821ef52b0a0dafad2593eedc SHA-1: 512ae2b004087d92793f3a2e78736f49531c8ff6 SHA-256: 063c794b56b349e1edd1be3148891327eb61fa13d7abec99922e6a9aaee1c26e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm pointing to various compromised websites, likely intended to trick users into downloading a secondary malicious file. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the malicious intent of distributing links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.isgs.org/wp-content/plugins/super-forms/uploads/php/files/ba760ff49abf3e4e4ffd9f623e5b83f7/55598378482.pdf In PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8ebb9d2af---8269061318.pdfIn PDF document text
    • http://dzbnf.com/upload/file///xotozotopidodasebu.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/18583459659.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/61943137281.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/soxozijazedofafodida.pdfIn PDF document text
    • https://giustofiori.it/file/98862167031.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/wuvuluzimevemirujilixexu.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/62191034dd874b97ab5a66850b020455/78832117355.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/xudosa.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4ceaa4688---fujuwozet.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/8fa54a7a970adff39fde33eb7a0e59de/614969443.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/fapetikuzan.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/8b0e6afc41405351403acde8e6df3948/wulafabowotaxanez.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/62844681388.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/58248530971.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/ruzisubexetatesidow.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/xevudapimikajuzij.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/648d52b3098538348812960e1403475b/mojixulamagiwokiko.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59d60257dd---jidiwomagikupesexakegilep.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/55434873030.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b50da2094eb---vibevedarowub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=spinach+stuffed+whole+chickenPDF 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_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102ED 17668 bytes
SHA-256: 774b78e1ca9f537ecab504d2d4156859268c6a682f61fc8230d6f76947229cf0
font_02_sfnt_off000130dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DC 10968 bytes
SHA-256: ae374a25924e0c8d71d42d6645ac2a5b76e0c80d79ef4b0f36476fe2fb3866c5

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