Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77ccec56afe3aaf…

MALICIOUS

PDF

80.9 KB Created: 2021-09-11 22:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b36c576f79901914230edd824455831 SHA-1: 1f8a79092fedc06d3f9987a2b2068de0d6d6cf6f SHA-256: e77ccec56afe3aaf3a5b690719a2e3d5c2f483586f15f88ed802a51b93d5c5c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. The presence of multiple external links and the detection by security tools strongly suggest an attempt to lure users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://schokoladenfontaene.de/idata/pepasozonexiv.pdf In PDF document text
    • https://exihomes.com/userfiles/files/nenivusokus.pdfIn PDF document text
    • https://biomisszio.hu/tmp/77785033888.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/zejidamololaru.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161377b623c891---pamojagebegoligawedebos.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/milakefedorotal.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/28934671171.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/lenoligakufemiwebuwuvo.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/97533457126.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/34285353077.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/86406350721.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/2c57765dc2a021c46cd66cc6cd12ddc6/75773741581.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161323034bed53---zanoxixevojudezatinesini.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a2c356c66---kekojaduvibi.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138f8390f242---60999465063.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/genabaxena.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/36779791151.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/mowevepezunorevaj.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/47410966107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ios+emojis+on+snapchat+androidPDF 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_off0000d70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF20 18044 bytes
SHA-256: 3a80e5309cb864c6874a575c1420e9377c6ee1aa01d999c57b82d21ab6b4a9ce
font_02_sfnt_off00011d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D85 10812 bytes
SHA-256: 7bd8d582a2dc54ffd069e724e8b5d4b944c4b81243639d6d31572074f44f4b9f