Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c3d2ec256a956a…

MALICIOUS

PDF

82.5 KB Created: 2021-06-27 02:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f51a569929a1d93dc327557600bb416e SHA-1: c050de39d1ec183be7e0bed15c31607c7f831193 SHA-256: 62c3d2ec256a956acab3bbcfab9d68af026e5c1b662d5284a5056b5b3aa0f886
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this document's purpose is to act as a link farm. The ML classifier and ClamAV detection further support its malicious nature, likely as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/a73afc3c57aac7518dbf24aebf70ef5a/54465296873.pdf In PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bffda7774da---73001469397.pdfIn PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/bcbfe1639d03dbed1b996c6d60aa9ab5/worurogisilowa.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5c34b7679---junutonugilezab.pdfIn PDF document text
    • https://dm288.com/slicice/file/libijopi.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe78e532ef---68574881584.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92902b552---32272652864.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811aabe246e---87532095556.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/5rj8lhnf0uv7t0fmbccp2fokv5/35390847064.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/habi4irmboru4hke25cvb7qcoi/teponudonupuw.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/cd4449dfaad63b71dbf48858f18cd5c5/dagukopazuwibidez.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160912d34473c7---sijuru.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430125149803064.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/88405926073.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/4d044cf87491d3f7fa4a9413e42f67d7/76352001214.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/4689718342.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021052620163699.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/vasetupinemaxevozabazubin.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074921d0974b---83096526692.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/wajutinamefudowukupop.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/8a41d06f1bebf44ff7132ba7e0351c49/xipedorega.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab85ec0a837---xupivedekurixone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=sum+of+first+n+odd+natural+numbersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D0 17968 bytes
SHA-256: a6d2a105cc799a1ecd3e022267e67ade4bdb276a35331776339e178bde68baf1
font_01_sfnt_off0000f63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63B 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_02_sfnt_off00010b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12387 10828 bytes
SHA-256: d1ab5470775621644400b949b554511278d04182285d6cf7442a61cf53bb7847

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