Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b95ea7c37c54315…

MALICIOUS

PDF

79.1 KB Created: 2021-07-29 11:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ba60a45e97370a935a21dff163fcca14 SHA-1: 1aa1e1c33f5603977fcc40f983e06afb158e3c80 SHA-256: 0b95ea7c37c54315b39645ee01f9caac13b2ff470377e60f1f2ef1ab194862f5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a tactic to distribute content through a network of potentially untrustworthy hosts. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://zhouzhuank.com/v15/Upload/file/20216292315402329.pdf In PDF document text
    • http://classtool.info/upload/files/81822414002.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607657cb77d62---jozebizizagav.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ce2e61e5ef4e262e511143fc750d6703/muvuregilup.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16088bc1b6f27b---59912343050.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/repamenazus.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1a4cbb47e---9021235531.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c17ebc8ba68---rezedu.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/77026559728.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/24631101660.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070b39beeea9---63990621698.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/jesuratapetofepav.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4857458ad3---43255877226.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/82938919749.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/vewogo.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fe8606d108d---mitidipenodatugifinala.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/64650067995.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9da131778---wedepasiva.pdfIn PDF document text
    • https://loctra.net/userfiles/file/dokezinefitozezelapa.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075741a318ea---jukatitododiza.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/31591168967.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4dp8gt2d4vlm2qu332igdke56i/kenosawujok.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/60922735624.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/dejufikezakir.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/85974397046.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/70201123077.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/ede4afee48f4d55216cf87142aa7b782/21442417929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=opel+astra+j+1.4+turbo+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_off0000d272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD272 15900 bytes
SHA-256: cd27833c1d7cb5ee5783713f7be7b749f84b013b6e04fb6b69ed49b81558a31a
font_01_sfnt_off0000fb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11386 11192 bytes
SHA-256: 73416eb67f93c7b74f00e4248fe691e3c5a3bc50d9c89d95ba88447c193e9807

Open this report in the interactive analyzer, or submit your own file for analysis.