Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f9e6e06cf0d230…

MALICIOUS

PDF

72.8 KB Created: 2021-09-07 13:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b18bb94a42bbda1205b05240b25f97a6 SHA-1: 7aaf143675ea02dca3fe5012454b98a86a190723 SHA-256: c4f9e6e06cf0d230ad0e8bb3703b18fefeb72240d159d0f446f39fac4a81b0ea
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous domains, many of which are hosted on disposable infrastructure, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d19d0e71fc---91664274390.pdf In PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/noziwidurodofotifunot.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/korazenokuloditovegotubar.pdfIn PDF document text
    • https://togeltop.net/contents/files/domoxogixep.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/jitugipos.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/56929608661.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b3b23b01d9---pokodazelidezavewuxuwepoz.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080b322ca8ac---44567047714.pdfIn PDF document text
    • http://biosite.ru/images/news/file/kuxepatebujasomuxis.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/69333418334.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/6daee63c3e608b7580532960c5dbb168/23612661884.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/2f0dc440ab07340886d2bce3b5cfd8d4/xupavubodewuxogetonafu.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/93194757372.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/6ph6pd3eugjj0bvg5e3tbksdv2/16690144104.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/47419743301.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/todekuzulufeponob.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/33711338277.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607485049b4df---80775715691.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/46378646983.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd9f0b90a2---xawafitubonabivimoto.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/27418676556.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae58361bc5---zefapimukese.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ac399b069---fobexopobilufapuzuvekasam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cultivo+mixto+microbiologia+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_off0000ba70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA70 10996 bytes
SHA-256: 73a3c5e60ba272cd5aa01b9324a24d27c3cd6dae51a57aa13b2dbe5e6aa56c76
font_01_sfnt_off0000d3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB5 16376 bytes
SHA-256: a5af178df98ed4ad5f40d937ac6cbbd65960c1ff594f51d680ed52e6c019118c

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