Malicious PDF — malware analysis report

Static analysis result for SHA-256 d272d024ba9da18d…

MALICIOUS

PDF

98.7 KB Created: 2021-09-07 09:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ebc12a951977e44d836cd783d59cb802 SHA-1: 86001c88b0833d0c9e679d6e4d3a8192320c9a19 SHA-256: d272d024ba9da18d5ff132121ed94304c1cf973af6f173f5c599d21e36dffbf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL distribution are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • 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.
  • 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://emauto.lv/index/images/up/file/79956597563.pdf In PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/duxagatemizarenukefewodix.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/gugexuwojufapi.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a4b681ffce037c7f8a06ed81b5599b47/27481780764.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/tizekixol.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/nerojap.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/difonupevo.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202107file/2021070103421670554.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/vimufaloliwepiloz.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/67309982224.pdfIn PDF document text
    • http://altinay-law.com/images/file/ripabozobaxajo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161113570d9288---68923799116.pdfIn PDF document text
    • https://asiajitu.com/contents//files/wavoderubikisigokuxogilew.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/459ivq6gp3j4hnotp4d8tppfk0/difavewebuwuzuwofupojitam.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/kevefirikomewarigamulerin.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/2181decc2c58680eda173521a2005705/44451332125.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/nazaxiju.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/51294777166.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e527e33096---95969694757.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611adc39d4be3---75462363914.pdfIn PDF document text
    • http://livestocktool.com/d/files/49864812401.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3fa1d99d8525c432e8f72d660835f686/mirajakomirusumojob.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/ditonatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=psicologia+criminal+en+mexico+pdfPDF 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_off000118f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F3 10968 bytes
SHA-256: 22cc2ab3ea6d75147a1884a8ef24add19b39edb37e5a83c8ea6f5d4ac282a16e
font_01_sfnt_off00013236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13236 19736 bytes
SHA-256: 9366df7dfdb4fc705598ee293301bcd58755718732dc156df05778b9b7391a28
font_02_sfnt_off00016565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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