Malicious PDF — malware analysis report

Static analysis result for SHA-256 520a6dd5c952333b…

MALICIOUS

PDF

73.0 KB Created: 2021-09-18 01:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 12bfdfa4c435faaf5a6f04c62c0bfee1 SHA-1: bff35c37fd2bc885e712883e0f7ae750c37bf8c2 SHA-256: 520a6dd5c952333bf97bf35e16ccd67a05ef3413ce6b06ab0d94f40fd3db6618
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 high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to lure users to potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://greensquares.in/userfiles/file///rezavedafobapime.pdf In PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/42463894645.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/15864894573.pdfIn PDF document text
    • http://iknow.pl/files/file/tepidak.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/titofosadaxolasefemovenuw.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/58270174099.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/16191812258.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/i44r9n14d4o2deq4g4q2ivemtd/lubudufirej.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/37750164813.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/wonemewoxiwapugajewebuj.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/dejusitedefabimovuzobapi.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/lavajetexesupapero.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/29516167679.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/36688593269.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/tudizarewigibawofikab.pdfIn PDF document text
    • https://renewone.de/files/77419611148.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/66099314879.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/30db5f6c8bf8778eddc4d533dc1ddd33/jepogakisuf.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/gikukexosix.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb685aacae---zanuxit.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/kuzosutedabofowufow.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/74981789667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=watch+the+imitation+game+online+free+123moviesPDF 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_off0000b9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E4 11184 bytes
SHA-256: 32e2b2c9cf7ab3540af6d8c7494e53e1a905cd4f7c8e11536f47ed2092277d62
font_01_sfnt_off0000d40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40B 16300 bytes
SHA-256: a54876274fae2e9c809306add9eb179bf733d7d84b51e41826d8d2ea05b2537f
font_02_sfnt_off0000fe18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1