Malicious PDF — malware analysis report

Static analysis result for SHA-256 727ff447f2dd9890…

MALICIOUS

PDF

89.5 KB Created: 2021-07-13 22:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 753f93b198bc82d3bcc7c05bbcadc48d SHA-1: 358e13f0e25aea0db327ac0d17703189e0173a76 SHA-256: 727ff447f2dd989042569937365d78ee9de710812705e3ce5588c6bd3a7d472e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classified as phishing and trojan activity. The file's structure and numerous external links are consistent with a campaign to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bccc07b2de---74836169051.pdf In PDF document text
    • http://billcolletterealtor.com/clients/e/ef/efe7172bdc9c6addedf700543cb5cb37/File/74658350233.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/54852844901.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/56507740909.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/068c21574ad8118f71aac6e825c8fab3/44591722828.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/800f8c1578af532082cd491673ecb82d/wepeleruzakomivovo.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/8048576651.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/2f905aad49c8ff9b69ffa01cf7ccc7ee/rutowivegowefer.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/ragugokusuvimas.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/56217167068.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/32210101385.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/0bm8qhm8r9p0pn05atb68auqg8/wesume.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b605758b168---4912741343.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/93172305289.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/7173606167.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cacaec558f---batavinenadotewifofubadu.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/57990e47d477dbe8758f61de75cad27d/naxadot.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/f8fe133a0fba4f4b6b7700018f03e948/56784205288.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/648f5bb0515ef22c3b1fe32292cb0179/fasazitazemer.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210617041128003.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/2c815b0562b3681c6fb7521e33c382c3/jitaka.pdfIn PDF document text
    • https://mszukam.pl/dat//file/panekanogemedofa.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/9391818293.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/24456845094.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/nafufetikodovaxoselusezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=show+off+personPDF 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_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 16624 bytes
SHA-256: 6c983ed4105aca16b4ffcdb8ffd713006d060169c9dbac0fa1ee20ed26c9da57
font_01_sfnt_off000129e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F7 10220 bytes
SHA-256: 76d4ea7ae8bbba514ecfb14be83d1402b492fb9956027c3c396ee3477916823d