Malicious PDF — malware analysis report

Static analysis result for SHA-256 85636e32e6011bf7…

MALICIOUS

PDF

76.4 KB Created: 2021-09-30 15:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bdf6e715cead0082e0ebea1f834b9c46 SHA-1: f5095019136acbd11823d9de08c1bcb1051d317b SHA-256: 85636e32e6011bf752a3576355d6e652cc9c500f9e083b1263b92e426e6c2cfb
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=do+come%C3%A7o+ao+fim+online+hd PDF link annotation
    • http://brlairport.com/images/file/kezemugonipi.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/86910285050.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///52249820009.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614314b9df6f0---20552904339.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/xelidafujugimal.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/80412941698.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/nonubasovawosugosexap.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/mukeruse.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/24929651124.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/2370493726.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16328905364656.pdfIn PDF document text
    • http://gtijsr.com/userfiles/file/nebixufejipoke.pdfIn PDF document text
    • http://eternaseguros.net/files/files/27058903676.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/dozomopirixupuriwilaba.pdfIn PDF document text
    • http://ahknchem.com/upload/files/donamikegowo.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16148c8f395911---52163346497.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/kubenebizudizag.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/gubikapixosalebik.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/utnoondu2vv51ua1lg5l9debd7/xunuzivumuwitilupumopefiv.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/turobekakojasozovividobib.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/475bd18872aad3487dc5bcbb37677aec/21467860548.pdfIn PDF document text
    • https://bdata.vn/upload/files/kanilajulomijexa.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/36989858952.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/50970198233.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_off0000c169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC169 19028 bytes
SHA-256: dde3a3f4aa62529ab6df8cb5b1e58044949070b62ce1f35fcea401fcf9d81dbc
font_01_sfnt_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 10572 bytes
SHA-256: ebaefcf397b603dd1b55e73cc3f67995c0297d316fdaff2a77ee0554f638c7fc
font_02_sfnt_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1