Malicious PDF — malware analysis report

Static analysis result for SHA-256 53031d885552e1af…

MALICIOUS

PDF

110.8 KB Created: 2021-06-14 15:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1263bc8d5b156c846204482e8cf1c533 SHA-1: cd60dcde8e79dabbb6ccb51c4acde5f279353d32 SHA-256: 53031d885552e1aff168ede323118b3bbb13b93c4ba893d7bd4ad963e4ed8813
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised websites, likely to facilitate phishing attacks or distribute further malware. The presence of multiple external URIs and links to compromised CMS uploads indicates a coordinated effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=balance+druid+pve+talents+shadowlands PDF link annotation
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/tugofofopopojiguwudesi.pdfIn PDF document text
    • http://ashioke.com/images/library/File/zovapakiwufenizovijuxa.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160bf087813a09---kinalodezesagopidikuf.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/47713898442.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/34480cf339875318efcdf5bbc9c7ff63/xinevutixorulitoxere.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/vs4uahe42fbo0fnmrmcv2dbkkt/93134953962.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f4b5b7239---waxaxara.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/1689659865.pdfIn PDF document text
    • http://webbuilders.com/files/file/76628444113.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c6072ec30---saziponewabubozuriz.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fa7fc26b6---14737747926.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607497e0182bb---tigetibowafolupibaraxup.pdfIn PDF document text
    • http://freeski.hu/freeski/file/megajumeki.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/6hd7ki6g5cl6q7dheal2dvtln6/52734909028.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd393de9e8---98649856728.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/49355359085.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00015d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D7E 5364 bytes
SHA-256: 903c70bf87beff185cec863b4deca1c13602f0fd07cd08d891af8e5fafe5a78d
font_01_sfnt_off00016fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FC7 11808 bytes
SHA-256: ba242602c1184be9fe52c0b16c6fb0ff925f4c5accaa3f01fd15f054febcdf79
font_02_sfnt_off0001983e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1983E 16300 bytes
SHA-256: 56e5a1faa6d79acc7ff1d6b5170fbb2f4cd2b126b9b6dce04ad6bb3caa552b0c