Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d410d27018dc4d7…

MALICIOUS

PDF

73.9 KB Created: 2021-09-12 23:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d82889c1c5154e12bc29291aaaf4f5d6 SHA-1: 6b6368dce21c882a20bbe013b7f81aecc1bfb338 SHA-256: 8d410d27018dc4d734afc85ff21d2560784800ec8581909e1ac1f5a18ddaf946
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and link farm characteristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rayocazar.com/images/elfinder-1.1/files/file/venaputomemujiv.pdf In PDF document text
    • http://www.nachtruhe.info/up/files/55970737694.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db36a61491---gamojelusuwaxi.pdfIn PDF document text
    • https://ahha.az/userfiles/file/totufesajulunesowisusalo.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/gefotazafulexajawororu.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/kejadujagol.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/cu19rogh9eflabhm33v1cksneh/xatimowulu.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/pisulofekifuxig.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/rogewamejobupezorobafif.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/fozulatasizawujifasusoju.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/7575740519.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/84160205310.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/puramejafobiseg.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/patoserikiwakugegimovowux.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/1jm9cr7kt527jnc65g4dsg4237/gitovive.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/92747849386.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/fuxufavota.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/detuzesawovum.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/85222067216.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/sasowejikigizabemi.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/duruf.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///16214933212.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210904141836425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=fancy+pants+3+gamePDF 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_off0000bf52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF52 16596 bytes
SHA-256: bed0a31e8047bac47255cc32d07d3005a780b24fb9b1f91c0287445777d4aa83
font_01_sfnt_off0000e9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F2 10624 bytes
SHA-256: 7ea8d6463e40d67a20ce12d43d63dcbc70e3c044bd9d373f2674cdc0c748d7c2
font_02_sfnt_off00010254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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