Malicious PDF — malware analysis report

Static analysis result for SHA-256 984bd006555e98d5…

MALICIOUS

PDF

101.5 KB Created: 2021-08-18 10:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c7c03a35524bce4c0b568f096035122 SHA-1: d3421d315852ca1488631b526c0d98abab0b0271 SHA-256: 984bd006555e98d5f8e012c54277265a8ae2aef8e92bc5102524338136db6bd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains a link farm with numerous URLs pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content. The presence of external URI indicators and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://deauville.ru/files/file/migefomaku.pdf In PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210815_2D09FD2E7DE7A2A4.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16115dc696ad1a---nurujoziwunebopibix.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/17483616968.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/korag.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/0adcjsanbdmkogjngdgngkfdp7/4822859831.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d19fe667055---setazewejenarin.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/32543570814.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1626203614.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/rafibodatudafujakeku.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/35644470865.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/c40cb7cf8798117b068f3fddbec5f318/xezitagunopezokab.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a12ff77b710---marukikubisibobogi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/cc0cjlgm57q3bevf9keou6kjm6/luregivudufuzitalok.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210801_214850.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/poman.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/10231714067.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/munirozanadazodekux.pdfIn PDF document text
    • http://iworking.vn/uploads/files/66972403732.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/8433ba5569030b06b3f8c00b73812191/rezuzonodoviwapiwukuwuxim.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16077f64491215---mejijekonipepezip.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16089c41d6240e---70741391808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=y%C3%B6kdil+sa%C4%9Fl%C4%B1k+bilimleri+%C3%A7%C4%B1km%C4%B1%C5%9F+sorular+pdf+2018PDF 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_off000121b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000139cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CD 12208 bytes
SHA-256: 2712628453b6b36316d4f2b2d061869c91d67fa5ddfff8bf8ebe418606335bef
font_02_sfnt_off000155f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F8 19088 bytes
SHA-256: 8526a76ba82d596fc801ca04fdc7cc5eef3682d9b0412aa240e281f1689d3612

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