Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c666baee93341d2…

MALICIOUS

PDF

85.8 KB Created: 2021-09-22 12:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 87b37be69ef9e6671128c06f7a1d585d SHA-1: f9ca01e35dc21493fd04dd950a5b4f9a24517964 SHA-256: 1c666baee93341d23e3c98103a3dca80b877959b3f29b01c2cc7b911911aa13b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites, indicating a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests this malicious intent. While no scripts were extracted, the structure and URL patterns are indicative of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/2p3130ke8uq4ta5vokug5duck6/31093589050.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398f9edb93a---62654063462.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/lemutatuxipu.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/768212e3e5ed347689fa9a03823d5fe8/mefuvugusutu.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/kijowinupe.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/66773212376.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/a3919d99d545f2cc6aebbd927ae71318/jufopuxopa.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/muleleforipuvenuto.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/37945075957.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///duwibufodepuki.pdfIn PDF document text
    • http://wuchem.com/upload/files/97227395122.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/sejixulel.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/91400870410.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/tenovaxadimib.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/sowiwuvupevivod.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/92327954641.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/24224638139.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/fevizex.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/fejesemojiwupip.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/jipebotavamez.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///88973545986.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210907011328.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/jowadowovupijupis.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/5406fca93bb7ae9e8843fbe7c5475808/35108341118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=john+wick+2+free+full+moviePDF 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_off0000ea2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2E 18192 bytes
SHA-256: 3b3eeb27c846d9c829e2bd38fa0cf8a12cdac796cab6a42c6d587147d8f967b7
font_01_sfnt_off00011991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A8 10628 bytes
SHA-256: e5c320b7ffad5ecd0ecd5a5d443cd99399bf0694ed38a09592054c03fa73c7ce