Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc85adf787cea57c…

MALICIOUS

PDF

84.0 KB Created: 2021-09-02 09:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e8dba09cb1801219cb341ca36186d17b SHA-1: d3b6eaa284054d2852fa3501f0b03cd25cd98698 SHA-256: fc85adf787cea57c5b6c3054bbd7946c23e3b2b496e33f012184a59643affd54
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. This suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • 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 http://masonfamilyreunion.org/clients/b/bd/bdaf0a3c19eb5f10f0519c747c117e37/File/bataresosepemovuzaka.pdf In PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/ebd60837dfe74737af4f69284ccef768/3434674002.pdfIn PDF document text
    • http://billsky.ee/files/file/40097779638.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/23ab970d560bc96668fa10a73b25b055/58328930238.pdfIn PDF document text
    • http://shesob.com/file/files/zapupolebogavadufenawapi.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16115753081352---90713997706.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/tuxajexaxa.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/92416647354.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/19193233184.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/44499278004.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086873802f3d---85601917538.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f170dccb6bb---pireberixefiwen.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/lezobejewelupifilujomuge.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/64009845672.pdfIn PDF document text
    • http://kaies.net/upfiles/file/nopuzomanapiwemela.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7baf7e694d259998f8c9ea3a7ca304f3/43363700765.pdfIn PDF document text
    • http://hzdsbg.cn/uploadfile/1627403848.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/jewubowoletabemewarekup.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/fdbb4c9c9f0eea6d4f484dc843ae1a35/selusupamujivukevewebof.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7e37b4ebc---5468283787.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8507286a00---saruritadoxufasexen.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/99448885901.pdfIn PDF document text
    • https://tomas-music.com/contents//files/86043481194.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec1958edc---fakap.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/90377054067.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/5b1eadf604ef9394955544f588bbf759/xumefaludiwovobe.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/rolexomebefitesirujonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=hailee+steinfeld+and+charlie+puthPDF 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_off0000e062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE062 18900 bytes
SHA-256: ffc24fdf090fc6d1853db8ff3e0f0d3891c62556234a55eac903b837ab060f7f
font_01_sfnt_off00011180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11180 10688 bytes
SHA-256: 652796de3c9cda14004aa2236f684d2e8bc30c9241bc01b9b61c30db718078e3
font_02_sfnt_off000129dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1