Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c833568ee830b3…

MALICIOUS

PDF

73.9 KB Created: 2021-07-24 20:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d3c2792dbb8d330e937f9d31aa150856 SHA-1: 8f9dd890b5bcd98efb768f82eed26b9aacaaf800 SHA-256: c9c833568ee830b36a279adb7b1dea8257a7fea1ec47ad44308e5710b7c14fc9
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/2834fc90e94878790593b40a29ec68ea/47433482919.pdf In PDF document text
    • http://thehonourride.com/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/8386929141.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/24f377b934890d424661a94c83229dd0/95117260268.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac85b77e90e---44284336333.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/duginawitodaki.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/zarefusixaxabelitofilomer.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/92289331315.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/78635328827.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782ff65c16e---74563444439.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/boxixupopudejikupol.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/3a617f7497b54aacaf556508c9fa4a5a/zibememakud.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/kiferalowodonokosolam.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/nepubizonasuvoreraku.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f03fbf68a5c---wemokamoxaluw.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/tebunobif.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/dedol.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2173aa6f1---21336363288.pdfIn PDF document text
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/kejufimekozovuwogibiku.pdfIn PDF document text
    • https://papiratisk.cz/soubory/mariwemidosajufufiz.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/wipikosoluvabufes.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/54301f32b009e9b742a60801ed817822/72622517027.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/jorojowujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+change+the+combination+on+my+sentry+safePDF 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_off0000bf34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF34 11068 bytes
SHA-256: 724e3253c7387759a8d5d251f6b9e327c82a1c9354ce87187e7089f43b53df50
font_01_sfnt_off0000d8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D6 15652 bytes
SHA-256: b794c7e54acd8d2f471fe3d605ae2b0df6a7244f0cd932dd9c45937d7301b065
font_02_sfnt_off00010117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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