Malicious PDF — malware analysis report

Static analysis result for SHA-256 df09431ea245c631…

MALICIOUS

PDF

79.2 KB Created: 2021-09-01 07:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: d5b606c35aa2a7ea77f7ff72a5af56a7 SHA-1: 81a47b38961ee24954e04bbce5625e4b6244dab0 SHA-256: df09431ea245c6318acd66318140b2e5bca1a69647a5c1a16923aeac93e9610f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://splogservice.ru/content/file/burivugurefuxo.pdf In PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c3ef4085---faxenas.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/dibitideziwuguxa.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609027da5bc45---97902579289.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/79975891192.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/bavikebuwuduvivol.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/52037439161.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a0d965987---jafowufes.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/39155285627.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b371c0035f---lubikekaneripajajubejali.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/xeweluxafuvogigowuvexojul.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210615_045639.pdfIn PDF document text
    • http://momsystem.ru/public/file/taredasur.pdfIn PDF document text
    • https://ahha.az/userfiles/file/59821791690.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/dizusapunez.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/tetanexepedim.pdfIn PDF document text
    • https://areicon.com/images/file/87956109795.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79271c820---titabomibomaxuxet.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16077399267bbc---mukimuramuvesezisusetof.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/59119551585.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2d16ba31a---17566108558.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/vopog.pdfIn PDF document text
    • http://runo34.ru/attachments/file/sumosilowami.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/78719136589.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/37359666127.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c069055153f---74212901013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=online+pdf+to+drawing+converterPDF 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_off0000d06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06B 17504 bytes
SHA-256: 222c1b7929dde617e40fe6dcadceeaa550a68e723a6ad7312aecf85fa4b646a3
font_01_sfnt_off0000fd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD48 10804 bytes
SHA-256: d69b1aedc7071962a9fa3d317a9a44ce0fb92d0abd758e0b1158b083847f2105
font_02_sfnt_off00011626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1