Malicious PDF — malware analysis report

Static analysis result for SHA-256 260b3baecb118a9a…

MALICIOUS

PDF

86.0 KB Created: 2021-07-05 11:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d5ec39d700d43b257ca2e2c40df75dac SHA-1: 122df1056942e7999527a790e5342e1ce8973da1 SHA-256: 260b3baecb118a9acbc6e92d47d4bf950b697ed4554a9934f41a7dcacac708cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics (PDF_SEO_DISPOSABLE_LINK_FARM, PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM) strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3ec2b84bd563f107c4505e7d33685d5e/bitolekitixubafis.pdf In PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/c5f7d6e9c031d89256d0a13430432c94/taxuxugujaruji.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d006d2eda2f---31678782632.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/fatuxojuta.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a983c27416---15510998247.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b86186d1fd4---35958484661.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/xamidilimewakafixejidude.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec821106eb---murezukopunubekasisimel.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/5529792506.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/462290be65d91a770957804d81f65d7c/zuzeduluxogoxaxazekijela.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/pekevatagebilu.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/90125590505.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7b19864db76cf098ff14b7a9616c6351/85768225642.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/25e322e6f8f2aede980720b6726178d0/donosevanutasisapete.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/88r6b9h2sjq5eit49f0cs5c9ib/28725012498.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb79485982---74729809762.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce7605698b---kubawipiradobedefu.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/9146585727.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/29874681919.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/42ad1d7d15ccd402b50cd7e35895c541/jureninazosivozoz.pdfIn PDF document text
    • https://roc.mn/uploads/files/12666275200.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/kemegamigafukafifiviza.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/2722254555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=nurses+day+hd+imagesPDF 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_off0000d88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88A 17160 bytes
SHA-256: 23557315a0276d175b4796af81f4db797b0faf457383fdc0370c65806bebfb09
font_01_sfnt_off00010549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10549 10520 bytes
SHA-256: 5d288dd0c0e856041bc49d615bf8d3862c7575db074ef6f1f62092f8bdafa4d7
font_02_sfnt_off00011d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D04 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off00013280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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