Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e342a5188d6d8f1…

MALICIOUS

PDF

78.5 KB Created: 2021-09-10 06:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b2cb9c135b1b867ed39332e2a036187e SHA-1: a9e52435fd9bb2edd33e2b46f530a82afd624e08 SHA-256: 7e342a5188d6d8f18d9aa139934d71a057ecea7212257adec06862baa6c47ab0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO poisoning. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smartpaintingplus.com/userfiles/files/65962145311.pdf In PDF document text
    • http://5m-tti.com/uploads/image/files/wamijemujororoz.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/fisegikesivi.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/031cdb5faa1845d02d878c8f8f5841b1/degifawefuwipewisaw.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/43667415056.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/30709986383.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133176796b13---kotunelijunabit.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/kajafigo.pdfIn PDF document text
    • http://mextro.de/upload/files/rujezogabaki.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/vetelabedunirepapepapipaf.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tilaler.pdfIn PDF document text
    • http://popmetre.com/news/files/98506872563.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/kefuwiwovenakorebinewus.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/41921376649.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/vaxufadedugomup.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/43599942546.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/17142436516.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/tujunex.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f613aeba46---fenemevanamazixezoza.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/repimunivoli.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aba34da56e---60369494630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=redmi+note+10+pro+raw+photoPDF 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_off0000ce6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6D 10748 bytes
SHA-256: e0c41895a6ea45f5fc51af99bea48c4d945e141f46a6a4e29ee61f09cfdf2ef0
font_01_sfnt_off0000e6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F6 17624 bytes
SHA-256: efdc081da1c38c61a739cc6b131cbb17c8d3feea8282a8a7c14deee69001f198
font_02_sfnt_off000114d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1