Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc0a04c1fa9a672…

MALICIOUS

PDF

77.7 KB Created: 2021-09-17 08:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 642f6edd9bd2cf437f09343def2a6965 SHA-1: 4136cdf37b42495fe565e4ce6039ae16c16386a8 SHA-256: bdc0a04c1fa9a672227514a0e557587d4eec0ec72e8196eb661186a015510d4a
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The presence of embedded JavaScript suggests potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=websites+similar+to+myflixer PDF link annotation
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ad01754414deaa867494182cc9bcc2ed/42748968306.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/63046546308.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/45275805666.pdfIn PDF document text
    • http://amdind.com/userfiles/file/jewovibofori.pdfIn PDF document text
    • http://wwstationery.com/files/file/33418174178.pdfIn PDF document text
    • https://coluer.ir/documents/file/nedelapikuxotunavoj.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134987453227---60047582810.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109130937241992.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/9k53ihqi0a60foiq9f27kef64d/ganumibijuvadu.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/rokisijivejiforixemofate.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/660c69594552df7c89b93e7902588c6d/53009758751.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/latobufemu.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/matorarabobukovininetoko.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/narukimuji.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/10469497393.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/t66tk5lct5otkqj71ms3ngola2/37403342961.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/viwopafivopigerebot.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/43891277219.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/99179415211.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/jekelopowu.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/gesodaludumokevun.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_off0000cc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 17368 bytes
SHA-256: 4cc6e288336fb83e04866f38aa40e596581ff4a2657436fbb8d180e2c0e163eb
font_02_sfnt_off0001113b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113B 10620 bytes
SHA-256: 62de23fa9026ef4acc705b2299cf1057b6c23e2cdd187abbcfefafb3426c8dbc

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