Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0b4ebab945891e…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 06:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 95c27861cffe6b80c58be4cd189d4108 SHA-1: 16c0f3043bab07fa46c4b19424f430a72907bbdc SHA-256: 7c0b4ebab945891ed01e367e47927741be7f2a5872b4f689903aea8f3061bded
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613389ec0dc5a---tibirimirur.pdf In PDF document text
    • http://goodwill.pl/userfiles/file/64000981057.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202199181666118.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/limaberudovawe.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130851b05c6e---nibududawaxudogosoz.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/57018682799.pdfIn PDF document text
    • https://newoptic.sas-global.mn/uploads/files/vudowezojolokulu.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/patusago.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/buxomusemofiviro.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/mefufunogelexakigosuvun.pdfIn PDF document text
    • https://gadapavimenti.com/GadaFiles/file/kexifedejevavokuf.pdfIn PDF document text
    • https://foulardfotografando.it/file/zuvirovuweviwe.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/21730183372.pdfIn PDF document text
    • http://sakem.org/userfiles/files/zubukadogud.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161302fbc4dd5a---nezizegow.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/gotifesibilizuju.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/xuvotiposaxitemiduvevo.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/96414764676.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/nudoperidoduta.pdfIn PDF document text
    • http://loxocongnghiep.com/MINH/user_files/file/18699385665.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/58034899021.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/puvamozigidufo.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/jajamawufol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=true+diary+pdfPDF 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_off0000b1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A3 10132 bytes
SHA-256: e9263ad6d5505f909c66cd729369f64d4e1fd742da560b9a854ef29fdfe45673
font_01_sfnt_off0000c85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85D 15252 bytes
SHA-256: 0edd583c70dcba0fd19c9a22ba143e0b65a16abc0beb6929f4e7c6e1f22ce810
font_02_sfnt_off0000eed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1