Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b56ad834529da7…

MALICIOUS

PDF

85.7 KB Created: 2021-09-14 08:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a748bfe3aa1db90850542cafc293f0ee SHA-1: 79bc721c02d85096cccd21c90d9e866fddf08d76 SHA-256: f0b56ad834529da7333f7e4f0d63827630e827dfc3c9b6e12324336a46dda106
112 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links, some pointing to compromised WordPress upload directories. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely attempts to download and execute a second-stage payload, while the link farm strategy aims to redirect users to malicious content hosted on compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hamzakocakoglu.com/userfiles/file/23725633143.pdf In PDF document text
    • https://girisimhaber.com/uploads/file/fedide.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/bawafinet.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/kininusararizo.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/kowakadiset.pdfIn PDF document text
    • https://norservis.cz/files/files/pusenidiwadiribiligedun.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4382a97de---80052256522.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/31336481703.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136516c0cc29---93321473938.pdfIn PDF document text
    • https://electroagro.es/pub/files/debofotuwinorojozux.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/nafakufobabimewutimeroki.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7bc3385ab---68368988295.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/1rpqpgik0n7llohgbvccl53i91/12990953747.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/golodesimufapufamuxigon.pdfIn PDF document text
    • http://myslizdrave.com/soubory/wuvazoketanuxupoxasakew.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/befupijotolo.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/73750450284.pdfIn PDF document text
    • https://limadelimon.com/images/file/lujoxapinoduronopurak.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/70987145271.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/dubifememobozivexesetu.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/2098482721.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/77205107709.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/dapilupomuta.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/17403957720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=phone+vibrates+for+no+reason+androidPDF 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_off0000ea94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A6 17620 bytes
SHA-256: 45c2c949e00687e7158335e4b8f7976e3050b514480ac37cab5fd2a7dac1c76e
font_02_sfnt_off000130c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C4 10612 bytes
SHA-256: ac44102ec27235d7fafa59f499a717995071dade453338833f35bae841cf3cd0

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