Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70fd8ffecf7d0f9…

MALICIOUS

PDF

105.1 KB Created: 2021-08-27 22:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8d4ee7ac391fc3999b3f34780b8372df SHA-1: 8eec9106473ab4000d815b5f1c2cdf396c285afa SHA-256: f70fd8ffecf7d0f94179a1a57870faff0d1c060ebd229b13ef383ce17c13a35b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern observed is the use of a link farm, likely to distribute malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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://drlalashow.com/php/billboard/uploads/file/12374242718.pdf In PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7cb9e520bb2ee99192bb3f961ff4f3ee/36329322649.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8e4e9bebe4d48ea4c3b9de3a6fe99f7/46890856054.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/firik.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/jobolu.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/bepapapituziwolezakizaz.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/diwonuruzekoroxabidawelep.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e9657304124---2232285984.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/66147790049.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc16801d70---jawilikanot.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/14657464970.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ul4pkpk14a2rn9tj53bev0oca3/dumuwufojarudavikamag.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/jiwavuxigomufuliwe.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf91e1f88e---sufuzojam.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608f41d802d29---zabar.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/66775851556.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bced86dce74---36488035888.pdfIn PDF document text
    • https://area5srl.it/file/6018234076.pdfIn PDF document text
    • http://medica-brno.com/files/giwajetikokujinagiv.pdfIn PDF document text
    • http://senn1962reunion.com/clients/2/2f/2fc2c703930c5c120d54ce0350dd22c7/File/6168449860.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/r6rfp9tqjheud7keusgk4sldb9/8164085824.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6789de018---motoloxogigutefitikizi.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ns9lk6j1ataen90krkt9jmk675/59279400351.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/66784877297.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e66665885f4---99348895244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+wasteland+annotated+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_off0001304b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304B 10452 bytes
SHA-256: a4af416d8e35d2adb37b934b62b2dfb75ff9feabe8aa4776ac4961c072c923fd
font_01_sfnt_off00014814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16026 20980 bytes
SHA-256: 6dbd97a5c5bd735829d5831f129e7b6aa495a1079ed5e1c7560424d3de5af751