Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d02247d141d65f…

MALICIOUS

PDF

105.8 KB Created: 2021-07-23 18:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 66b67893270c9a2d396c33aa87a82512 SHA-1: e5714eefd6e6ebf86688bea3cd6828817054539b SHA-256: 38d02247d141d65f799b0298e4ab803db741eceb865e43a5b2f1e96fadfc292e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites hosting further PDF files. This pattern is commonly used for phishing or distributing second-stage malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46c2f8fc78---7981336816.pdf In PDF document text
    • https://ipic.vn/userfiles/file/pubuvapiputaz.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722c2469877---21235916723.pdfIn PDF document text
    • http://cooperclassof1970.com/clients/9656/File/64299730810.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1b0b59de9beba8bf236d5016d0453092/56122345825.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-14/20210614173558771464.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/57020437654.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/84021605096.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/31bbeab0e56e91efdfefda4527563d79/69519057813.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c9828e78832---rujulutagaxifupinike.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-8/20210608224149888175.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/48888757766.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/83073273095.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/91322220869.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/79287965113.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/8mlvv6u4uf1hrgjs9funj5lao3/tasejoxivafaluxiresobu.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9028847cd---jexigovoxozoja.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/askcnpo0a9kfi93jqv1gvrlgau/vavegikeguzi.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8f72d8df1---dupejegupukavewuritaz.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5943da85c0---36401558894.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/jogosuf.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/6300441772.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/zoxofipevop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=who+is+the+richest+igbo+man+in+nigeria+nowPDF 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_off000134a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A0 19136 bytes
SHA-256: 3528c855cd6d5d98865f490424f296bc019c4d3a7e9b9015757f2b2670db3655
font_01_sfnt_off0001673c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1673C 10848 bytes
SHA-256: 1c3da238cd6eda14c4012ddc087003bd0b81b871d64993cbed9ec4bc324616e4
font_02_sfnt_off0001803a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1803A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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