Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b2ef0f57b4dff80…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 09:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 21df814b092f25e5a5ad26658e73b5d3 SHA-1: ebea743cf42fa8b87fd64250d7d60d0b298c3134 SHA-256: 3b2ef0f57b4dff80e2d0241294409f8886ae6dc191f52b51def2b8f7dc612eba
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. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not appear to be directly executable, but their nature as part of a link farm is suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://iqlacpro.vn/emotive/upload/files/66976605276.pdf In PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/notixa.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/594beeaa2618d351033774c2913b336c/neguxubisuden.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e70f9c257---17213034126.pdfIn PDF document text
    • http://come2menorca.com/images/file/lijep.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/6040875418.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/80829477192.pdfIn PDF document text
    • https://parkettworld.com/upload/files/10186918102.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/98922490618.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/54ef6c5fed634c6d49c65ee8d2fecd4d/sutufetakogerefu.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/zeropinubopujajixukuwu.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/mubapogo.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304c6c52311---dubojukawasoxirowofefep.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/10073915557.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/e71e2b0c11c892d78cb0965a12f4dfb8/gusibejajimale.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/tujazowid.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f3e4b17439e45b8ad2a441f956e7e35d/pezinenodewenibajoge.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9327904a581c19482f30e53e27f7c257/98089366416.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607464ec25392---59444579772.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/jifejilibasofozudixal.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/81447161811.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/77ac3a9e8a022f67290cf4cab73455d7/xuliba.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/23234275278.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/brpv25gog1f6pbdm0dofupmrs6/bivanademodosukizozapebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=correlative+conjunctions+worksheet+answer+keyPDF link annotation
    • http://irodori.kir.jp/files/file/98208092687.pdfIn PDF document text
    • 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_off0000da90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA90 10948 bytes
SHA-256: d7fcbefebaf154f6b808f41a035184f180c964674cd7532df4075f2acd9a3c9d
font_01_sfnt_off0000f3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0B 18612 bytes
SHA-256: 9a9b2c473e0afab3327a3eb8c272e0b168dd1b91d7df4bb29c705d618200d47c