Malicious PDF — malware analysis report

Static analysis result for SHA-256 3955b5c6146cb27d…

MALICIOUS

PDF

217.2 KB Created: 2021-08-19 17:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 383f143e9022c8c584170a2eb8d01736 SHA-1: 69cbcd5915e6d8ddbb35e179e55dd4a5d5b46d5c SHA-256: 3955b5c6146cb27d0e648e67bcd71ba3290f7f4c5b6585dbc6e4ebf07733d50c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, indicating an attempt to distribute further malicious content. The ClamAV detection and ML classifier also flag this PDF as malicious, likely due to its phishing or trojan characteristics. The embedded JavaScript is likely used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8403

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.
  • 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://postelezmasivu-liberec.cz/ckfinder/userfiles/files/30878487474.pdf In PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/62303035979.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/eb2edf0d9d49f5d7432f5ac5d7f227ab/dawidexenupudixumoj.pdfIn PDF document text
    • http://cjatkinson.com/userimages/20148291931.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8e8300c7d---56439284380.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ceab5ca015---68564111321.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/3sp7runjvm116c60k02e6pt2up/kisalitogofatinepur.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073020a1e6d9---57770437064.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/224d37a2cdb9bb1dedf6ac426a316491/siruvabusozo.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93ecc621a1---votimixolepixavob.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160869f74b496d---32821427879.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gigoworovexanidugurelej.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/56rshapas9sb0mkqba75dvhci7/kapufubadusetisud.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84791500a---23834559600.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/xifawazagazerumatesibe.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da2843c014---vimofaf.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608177f630383---mafixekiluranilaxagor.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b730112b39b---75558492324.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/76448926596.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/bawalonawum.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/96797080519.pdfIn PDF document text
    • https://serka.com/serka/upload/files/lujidukejurisuzaropegezi.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078698f654aa---57671545492.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/xufuxuligomibibovojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=dmx+death+reasonPDF 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_off0002f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F390 19260 bytes
SHA-256: 88f263caef5553b9b9e27f3aed3a393b4a26d55e20b0a02bc429f29d501bf901
font_01_sfnt_off000325f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x325F4 10480 bytes
SHA-256: ba0203b81ddcf9d28f75b84ac3e96102524009592fe9b4017b8a6fe6d0a7961a
font_02_sfnt_off00033d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1