Malicious PDF — malware analysis report

Static analysis result for SHA-256 33da34fd166d53f7…

MALICIOUS

PDF

74.7 KB Created: 2021-09-19 11:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a0099504913bb74bb3f8825d45700f3 SHA-1: 9d7a990af4e0312d47aa1c4bda82711d3d20ce04 SHA-256: 33da34fd166d53f7376775bd86f9cfb668713e9d34abb9ab248f0da9b71649f0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories. The primary attack pattern observed is the use of these links to direct users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://wastran.ru/uplcv?utm_term=the+wedding+date+full+movie+fmovies PDF link annotation
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/ec418988961a331a7263cd3491136390/82863124462.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/lavedonukebarawerepe.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/zitulimemowanoso.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/40096608509.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/beseviwisusem.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f480924cbe---36493419886.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/renunisomaroxokilokodofo.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/57027668928.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/junotusavujuwiruresumut.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/2639507859.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/vodolikulowazetolevemuj.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/nigixodokobaruretuf.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/nulavapozefawav.pdfIn PDF document text
    • http://taigesw.com/upload/files/96645737188.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/42766986660.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/24164054681.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/wugizafu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c9631a3e809f01f29549c9809156320b/webupoxexasowalijodeviz.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/7a85973e9bbbb0fa3e95c89624441c3e/47125854164.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/suvalarewalibizaliwowudo.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/watimutejuzijuxemaneregu.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456bc73e9f6---fepajupuwezezimisinor.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/7900942418.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_off0000c0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FC 10916 bytes
SHA-256: d6a8e79e32dbdb9bbcb1d6de68094f25c365ad8b686bc6521fb84a7cfb868c9e
font_01_sfnt_off0000d9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20A 16724 bytes
SHA-256: 1082592f89d8fd70499b9b6da503e21a3563f45c273dc1af116fefb47721c333