Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb854b21e7817a90…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 06:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b575d3997f292551a57b27c3df9ccf5c SHA-1: 931d0a3ad0674ba87df85c798a4d08ffc3e79b9b SHA-256: bb854b21e7817a906be2fe5bd38c95a4f547c5bcd084b5c89ea5b2db763790ef
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to phish or redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/f187b40a858bc308d7faa8bf9fe4c119/fezewiranifiwonipakapari.pdf In PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/tirazajusot.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/37307953172.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/b9db3iqcf3794352l56ion8mjp/zejokam.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/vifazoga.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/a39kmkdjf1737ni4lkkt279nf1/niluvewazude.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1a9eede75---96816443.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/gekonod.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/33308437830.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979d4c030e5---31812297191.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16074fb0c5cf31---37703308873.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b520023622---xipalijawaxarepeworagil.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210625_224657.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/53086236055.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/88351000940.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/vasogazarowagu.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160fe54df242cf---19772539219.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/1549b4f54273157bb98dd8f67df13ce2/65844029713.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/91186658601.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/ferebidisamexawuxenufur.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/57709028395.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/a18ac03c725d4b2a0385874a359dcfab/26781622527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=2009+honda+rebel+250+service+manualPDF 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_off0000d84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84F 11288 bytes
SHA-256: 678518fd7b99c154784c0ddb8ced1a02d03f2f32843e9764f568fb5534f87edd
font_01_sfnt_off0000f2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABC 18272 bytes
SHA-256: 208edb5c489718b93ea790ddee7c08b9953f57ac96b0740e1f4f2c1a5eccf85c