Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa0589281951e79…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 19:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 39f90db9b8b22e3e922e7354e8ae3998 SHA-1: 1ff32e99f5ca69592cb808fbc25870f34b46af8d SHA-256: eaa0589281951e7941fb54eabb3d157bc5453f9577ac40792319ddb124fe0de1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9974

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://hojoairport.com/images/file/nubunaromori.pdf In PDF document text
    • http://brandnewgoods.net/userfiles/file/badugekenababotuvol.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/f9ind71318g71p7leeqnv8be19/towewitulove.pdfIn PDF document text
    • http://chemicalengineers.ie/images/vakodaroz.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/76144602455.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/fovumavaw.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c3c822b5---55485261106.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/44388280420.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079faf0a4d8b---19289861645.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/37708768918.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/61691632020.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/76177532536.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607208d8896c0---lemeverosazetaramutixese.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/17529308728.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/87638867866.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/toloxaxenikudosuduxi.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/52402988260.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c8c513792---jakopin.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/epq02tqf2imhg463a3kvhqlnb3/vagosurupasa.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/55582650153.pdfIn PDF document text
    • http://farmina.ru/uploads/files/84579233984.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f0684acadd5---73769452927.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/torege.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/f4fd627fa135c723f7791658a1b98d36/85486439539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=emergencias+pediatricas+pdfPDF 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_off0000dbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF8 19040 bytes
SHA-256: fa1b4acf3648cb356585b604725d4840c4c4b5a7e5232edb5ae91ee404671e80
font_01_sfnt_off00010c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9C 10780 bytes
SHA-256: 58135c52c3428ff132c5b2ae6a4b5405a1ba4f9a3a936e9d5fae8c0ff54a22b8
font_02_sfnt_off0001252d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1