Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b63beaaa08832e…

MALICIOUS

PDF

78.7 KB Created: 2021-09-07 18:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 883938fd210cbfc3f2fc889353afa065 SHA-1: beafe08a4ab62f5f7f2527f6216b6a089049593d SHA-256: 24b63beaaa08832e3e0bcab6abe0e0b5d0053c4034c47ecee600c33da0941e0a
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are consistent with a malicious link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://bonfiremadigan.com/uploads/fckeditor/file/91801417852.pdf In PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/tcmoa3ntnccpuhvdh7vg21dag6/saxiritipezudop.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/38f96t2ptti5kh3l35qi2c2sn7/22626390282.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/95108444313.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2ftnrvfhkbko0a65keqga79af0/37771190437.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/kabegololujefofakewewina.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/r68t96tqf9utudbu03ve67rpt6/12807211611.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/99449345886.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/59693518404.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23173bbe0e---wonukofo.pdfIn PDF document text
    • http://keramann.ru/uploads/files/sivudejitewuvof.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/kogojosawitefulumawagif.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j464cm1l7jdorushgcq72oplg2/zapagaputijojozafa.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/hdab629nhnb03enqqe6rsrm3j4/rizigilisokixexafuteko.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210626092934.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/9o6jk9nbbjkgju5stcou5ik639/64212426656.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbd66ee78c---rowudapuwilemavugiruw.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161151445d1904---23940454092.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210630_74D0CF490C80968D.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/54891609407.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/5f95494d300d9a4d64e044b0ea291dab/32965259311.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/minuluditosor.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/72714317615.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/levapebadafadalazanezo.pdfIn PDF document text
    • https://tomas-music.com/contents//files/33022414079.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d261480a1ff---44262020853.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/rizose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=spring+tutorial+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_off0000cd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD42 17712 bytes
SHA-256: db392ba647a1981227c4394d5528a69965e4bcb0ea76fd78bab81d710dd81c7c
font_01_sfnt_off0000fbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBC 11048 bytes
SHA-256: f98b4e09088cc97c7790944ed55a846e2b3b7fa31eca4d96709baacfc3471163
font_02_sfnt_off0001156b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1