Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86357e469efaaed…

MALICIOUS

PDF

72.7 KB Created: 2021-09-20 03:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2d5e16815d49882d57d019b2888bd3c SHA-1: 3e2ccac45359537971046dd10ebb4be920eb44be SHA-256: d86357e469efaaed4b7fae00e4be48c313fbf014e389285de6c40144318a43eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://queure.ru/uplcv?utm_term=android+studio+32+bit+free+download+for+windows+7 PDF link annotation
    • https://mpksieradz.pl/upload/file/fepuvagogaj.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/memaregetojujore.pdfIn PDF document text
    • https://alohasafaris.com/files/vedurolej.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/pufumofonurekagofevezufef.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/rivumifakowadiwide.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/lomatidapov.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/62675267223.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ragaxe.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/1b67b79a7ccee58327b9ee525e0cf6d0/xokoludunilimaruzojuxama.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/1468805012.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/gufofakax.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/diseso.pdfIn PDF document text
    • http://insei.eu/userfiles/files/giletezetujovajuposad.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/6600765326137e04467691.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/penuvutoxexatikoraditit.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba7bf1529---fokageziposuzuvigisobar.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210905_4A4F0F7DE0216DF5.pdfIn PDF document text
    • http://splogservice.ru/content/files/surufom.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/486107602613ab5305f032.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9ed0b4438---39265967155.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/disadaxademut.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/42887714531.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/pekisen.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9cc759641---gujavatagarexabo.pdfIn PDF document text
    • 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_off0000baa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BB 15868 bytes
SHA-256: 3f60966aced9a3681e3cc71f4423ab5cb1dce7ec6ca952fcec81a3cb8f6724e4
font_02_sfnt_off0000fb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB59 10996 bytes
SHA-256: 3652c4dc9d51563782a5ceb5c093c7e5aadbc83af1a3821b4e6f0a0766f6079c

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