Malicious PDF — malware analysis report

Static analysis result for SHA-256 488dd599cc57f180…

MALICIOUS

PDF

96.8 KB Created: 2021-09-12 19:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7e4e5a4d13af55a95e52ddacfe5eb452 SHA-1: db815d0d6697823b60176774b8d7051c4ff5dab8 SHA-256: 488dd599cc57f180b44495347f055e712b006c15e855ec312b4df956e63eb90b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to numerous external URLs, many hosted on potentially compromised or disposable domains. The document body is heavily obfuscated, but the presence of external links suggests an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://irlanc.ru/uplcv?utm_term=saiyan+goku+tap+super+z+mod+apk PDF link annotation
    • http://khojedu.net/userfiles/file/pamosutixunitix.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/2019458757.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/vilinudanuromiride.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/barivu.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/69772767529.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219112145405180.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/94680978445.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/99314427730.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/zevijotovu.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/d93f61c441a8adb3ad3a5ca9bf67ad38/jodagepokotetel.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/945b751acdc3e9e8364bee0d682206e6/lorowoluneb.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/wagagewabujiwivavafu.pdfIn PDF document text
    • http://bamor.org/userfiles/file/xizimikiguzonima.pdfIn PDF document text
    • https://epiphanych.com/images/file/80116724490.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/xakoj.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/62498795084.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613598f92bbd4---65244169946.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/mugemutakeb.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/wovusa.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4f12934d1---tujedoxovoxuraxefi.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/22244679259.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/rokutelinimatijaze.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/mixezurekiduvunu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 24988 bytes
SHA-256: 48941a5c75f7677c1951c79d75177abf3d392afd3c054ac8c291f823a7840248
font_01_sfnt_off0001250c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250C 16168 bytes
SHA-256: 6cba6677bde0f241d5abe4bd1daabf497e221bd6197b657de4268e87bbbbfee9
font_02_sfnt_off00013aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAF 11128 bytes
SHA-256: 74fec89ff61b25a0cb30c911dcfd1e90b4b26dc66f6ae092eab85519d3a237c2
font_03_sfnt_off00015485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15485 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_04_sfnt_off00015c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1