Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe735f0fe775f27a…

MALICIOUS

PDF

74.0 KB Created: 2021-09-02 08:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1899ae3bd3f29d41171f9692fc46b955 SHA-1: 98503b1a29237d712b488a7b3e41124856f00f35 SHA-256: fe735f0fe775f27a74da0dbea478470af62d71370a62ff39bfd974c044f446d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely phishing-related. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allaboutdowney.com/userimages/wukaropejodadu.pdf In PDF document text
    • http://bajcsidavidfoto.com/_user/file/nasefow.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3b80112e0---91397835026.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/tinorebelina.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b43fca6ea7e---gevuputeduvope.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/burafe.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0f4072a4b---futilajeju.pdfIn PDF document text
    • http://mc-opony.pl/files/file/92902568727.pdfIn PDF document text
    • http://strandedtattoo.info/file/vakaxamogufizikunugex.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca56fed1e1---rusurimatoju.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/e35153fdbb5553de7796b72b4f694afd/74504767774.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/fomomakojotej.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/42140194663.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2c68664d9---46656687793.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/47679e89773dc0a206e55ce8d662bb01/18380694580.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/92369202490.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/4ded4698e243e5a5598c9774411a9983/nadaruza.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca8a6d5c4d---teregiw.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/4b30517c2a85ace8e7fff6594b3fd0fa/maxaledolenitadovejari.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/127090684660c9baf0d4b0b.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/66979414953.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/e1198034f6ee842feb93268e76799238/xalirisapop.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/ditamawawuwemowoxuguza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=introduction+to+the+theory+of+statistics+pdf+free+downloadPDF 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_off0000bdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D7 16608 bytes
SHA-256: 89eb4e0f57df6f77e2d77811d61747c4d9f5cc4e0a6fa1dd08092c1d6295c8df
font_02_sfnt_off000100bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BC 10968 bytes
SHA-256: b7462bac135f181e27563fb5ad0e7b395933466c9b115c31b9a7173928db195b

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