Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5873f6545cb7d7c…

MALICIOUS

PDF

82.5 KB Created: 2021-08-26 23:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c89bf1a9bdcdfa1fb59f8f782e2dcf10 SHA-1: 68ea78372d1db1e73f5b7edc0c700c73098eac15 SHA-256: b5873f6545cb7d7cd63436d852b78ae9f8b1a313ac6ec0cde5935641b58c35fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://df-2.de/images/daten/file/98852526783.pdf In PDF document text
    • https://global-product.org/CKEdit/upload/files/dawebabaxoz.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6125a73f0ca3e.pdfIn PDF document text
    • https://faceless.me/userfiles/files/52956723410.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/migeziwalitorutisifuwox.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2ec59b5781911302a88dc2f47e499511/26976519523.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/xaxuboputezogazadukawemi.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/78421428535.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161251f0cc30c3---77356517233.pdfIn PDF document text
    • http://ledson.ru/upload_picture/88780881748.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/23705822289.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/jutatikelugu.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/titaka.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a23c9cf49a---80650296686.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112acc067368---12489329889.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202107132149219550.pdfIn PDF document text
    • http://apex-architect.ru/images/file/xubuzofedoforisaxegeje.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/1331239115.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/3fd6d0e037b534c53e0f631dbb7b3633/goluk.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608339471dca5---tejenuwasumevusetojet.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/19a99ee73b5ea3abe99f0ec5caf50a80/fuvewegewafetajeresuwiras.pdfIn PDF document text
    • http://e-hematologica.com/users//file/13197213071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=profile+summary+for+it+support+engineerPDF 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_off0000defe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFE 16724 bytes
SHA-256: 5780b2fe02be00bb814345595050b3b53683df504d8846d83641f5fd947265a0
font_01_sfnt_off00010a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7E 10916 bytes
SHA-256: cf8b163e009890f8594756e7fb9d0f4bb598b9261f56a17a0aede4c9b4412bd5
font_02_sfnt_off000123d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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