Malicious PDF — malware analysis report

Static analysis result for SHA-256 548d7175414587eb…

MALICIOUS

PDF

74.2 KB Created: 2021-09-12 15:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6da4f6f867c9f048f67d206f6e98a06b SHA-1: 2607dc21ba084938b96bb9a6f3dd40eaa141bf71 SHA-256: 548d7175414587eb34ef94922fbac60399bacbe669c4b50931eca2d7bc5004b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous links pointing to potentially compromised or disposable hosting sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded JavaScript indicates potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://drafthe.ru/uplcv?utm_term=7th+class+maths+textbook PDF link annotation
    • http://studioferrato.it/userfiles/files/97870994793.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/xilamonazevawokekufetud.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137de9a70b16---40626460377.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/64534047610.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/wenibufozep.pdfIn PDF document text
    • http://boldogelet.hu/media/gunosemefofaboradivawa.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/80481075558.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-12/20210912194840902885.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/zinezajuzud.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/sodikebuxipafuv.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d67ea6782e---xupufaguvegaditip.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/68269552333.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/73317258006.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/78840572786.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc3787022a1daba5c82415f4589e800b/wosivobusoratupadolebagi.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/rurowugepadejudageta.pdfIn PDF document text
    • http://coachhouse.info/assets/file/63160727856.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/98527621824.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/71747119180.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/nodobob.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/66614124160.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/jalozosan.pdfIn PDF document text
    • http://newshop.jp/archive/file/zizuzizuji.pdfIn PDF document text
    • http://hevolta.com/upload/file/98550329114.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/topizanakolasogegegi.pdfIn PDF document text
    • 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_off0000bde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE7 10484 bytes
SHA-256: 13ef49e20b680b20f890e75ebbe27d5347513930ec5d109ff29a629e0204aa9f
font_01_sfnt_off0000d5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 17368 bytes
SHA-256: 037c2456e6f873503efd4257a2b0e87e8130e81ed36f4509ae40465b58c25435