Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb93da2441ac962c…

MALICIOUS

PDF

71.2 KB Created: 2021-09-29 02:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6038182e2bfc98d0bcbfff2aa1c7332d SHA-1: 25e148190652dad55969c6abc7afef19e196dda4 SHA-256: bb93da2441ac962cca041e43d9c1918dc451716c9540e491b5e5b6a283633e5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.icf-plant.com/files/file/simif.pdf In PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/nelonolapawifujotalew.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138ea35195a2---saponovirokeferamowekige.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/42898817293.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/rojifenesevodupexeri.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/mokokevaj.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/22156061387.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/76602984425.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/bapabowetezepoxifowiba.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86d7463dc---kuruxof.pdfIn PDF document text
    • http://maxbrio.kr/files/files/17390957261.pdfIn PDF document text
    • http://secretinvitation.net/images/files/jilefulemu.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/30427768876.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/kugitur.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/tojofimiselovopet.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/781875915.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/f000e01519a8c8be44cbdcc69ef80264/sumuwelexaxutunogaruwolif.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/51608900571.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/52552543713.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/79721241818.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/20952845893.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/36983079444.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/55766712418.pdfIn PDF document text
    • http://raczcsalad.hu/files/66542843295.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/99643932308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=world+biggest+economy+list+2020PDF 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_off0000b426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3D 11040 bytes
SHA-256: 56a45806291faec086d9894d3e96ae77484feb37c970b13c8852f62cb8499ea5
font_02_sfnt_off0000e5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BA 16052 bytes
SHA-256: e11ee254254f6aafcbdf069597841156104a8df3b14cb0e3b7f30bd63522d45f