Malicious PDF — malware analysis report

Static analysis result for SHA-256 08350e3ce9b135c8…

MALICIOUS

PDF

88.4 KB Created: 2021-07-04 01:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2665c0af3fcf455ad9f7b35e09f677bf SHA-1: aa567490f9921daea34b6308c3340c0e5b1cc2f5 SHA-256: 08350e3ce9b135c8eb35e02e5208d52c131a2d4c33b3daac4831bda18fae9155
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or potentially disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c860e074a81---52599482294.pdf In PDF document text
    • http://autohondl.cz/userfiles/file/weloduzupubukiva.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/c85gb8lpa6b3cp9eng3sjl58ip/xizigalipawuwonu.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/topujiwisopelimerameruno.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160815a6b9ab27---sedonulipinakiliz.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/bixumaxul.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a46a2c9a9dd---52214981193.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/jegiwimuzubito.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/49444754608.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750e1b39cd4---posavugupeguxasali.pdfIn PDF document text
    • http://thepdaitruongphat.com/upload/ck/files/5629773010.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/448m57h7q62bf3l433acfomv96/903170425.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7c0a0cc3d---92325357062.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/4ab310a0099babc684b0431698cd9e07/80660175360.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/85078669439.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/28552341145.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de41a835cf---jinurobesurikelo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lm9fm5s61fjp84n7sbb35ac738/26684233376.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9e626c1c0---2741264183.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/44665679664.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/6cfe0b88899dd9731df7cc601058c25d/70681158982.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/loxaxamufutorekev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=which+sailor+moon+character+are+youPDF 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_off0000ea44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA44 10700 bytes
SHA-256: b360539541d8591f4433be82f978a8895c410b56ebaef9c55c23c54de553d328
font_01_sfnt_off000102b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACB 17540 bytes
SHA-256: 24fda0ef39ada468905474df74b588501d0e316a6db726dd78119077cfdeb29b
font_03_sfnt_off00014800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14800 2832 bytes
SHA-256: 7fc38f46af0135eb906da69d1f64be493ca836502659f79944c7d7bd6ecbe7cc

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