Malicious PDF — malware analysis report

Static analysis result for SHA-256 defa01507b8904cc…

MALICIOUS

PDF

89.3 KB Created: 2021-08-15 19:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d9ffdf3f6367865af8548c9fa96f26b SHA-1: fbc7a5378d3027a86452079034e9cb0f6f53d414 SHA-256: defa01507b8904cc97cccbe880fa8a3bc1aed938d596236dc6e37ddee9897a98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent, with the latter identifying it as a phishing trojan. Although no scripts were directly extracted, the PDF structure and heuristic firings point towards techniques used for initial access and redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://yildizwebpaket.com/calisma2/files/uploads/50170578389.pdf In PDF document text
    • https://proartgaleria.hu/files/files/4219621993.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/3b1a873b68a6cc151e0bfaa66e39bf62/gatuvemufofuwep.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608325252f695---90260891344.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d19c4c604e---zitorurilobujuwofi.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/tagaxazoxagutaxe.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611448bbec921---bubopovexuwekiforavurakag.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883f9f6ae34---99778934473.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/lesetexufepopifex.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/55490505857.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/78427258737.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/supatazagamib.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/56615923698.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608af978b3b6d---tafuxadofegokixivexoji.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/fojomadosi.pdfIn PDF document text
    • http://skyparadisecoffin.com/images/media/files/gonexazefelovu.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/22487508650.pdfIn PDF document text
    • http://xsjprinter.com/d/files/10564459592.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/nijabele.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/nvd36in97houtb7p2vdgih94r7/78065305458.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb8bff2318---ginokidisipa.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/08/11/74407099827.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/3849e78ab79df28ca26b8b92f9e86741/takafimevopipanejosame.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/gogageseterof.pdfIn PDF document text
    • https://fallsplat.se/file/99581009616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=financial+accounting+mcq+questions+with+answers+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_off0000f42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C41 18016 bytes
SHA-256: 8718a3d775f78c3c1b23d66b526aced8378d99cf8bae3b255c1a291a3d371ade
font_02_sfnt_off00013bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB3 11376 bytes
SHA-256: 5b061b55a9bbffeefae997c08f8cbc602396460c677d6b1149059ae5df8db4c1

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