Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d971877f5205a2…

MALICIOUS

PDF

85.7 KB Created: 2021-07-07 12:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 482c27b655dfe1ad1d2c66bc94b99e8a SHA-1: a3bb588125027032b9fdf902635cf0f5fa33fb30 SHA-256: 45d971877f5205a243c9e755de6d12ac35f5e4fa3b45693df880dbc31d03c3e1
96 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 WordPress sites and disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the primary attack pattern involves directing users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3aa197cdf2bdb5dfa9f65b63aff01901/xotavisajiwo.pdf In PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/6b564d6ffbcc6c65798928540002cfd6/91370519101.pdfIn PDF document text
    • http://thedreams.cz/files/dilaminozadim.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/610a986d60e65c7d7683828c7b211cf5/volelutegatafopopufix.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/busodabu.pdfIn PDF document text
    • http://bristolvietnam.com/upload/ck/files/92882422238.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/wizil.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/711625921.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/malobumesonapewimodo.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/o23mgfkjoo5rmlauh9olg9e4kh/xikigesolopamumen.pdfIn PDF document text
    • http://araonline.hu/uploads/file/rexoseb.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ucv6eiam0m45750bfgkbusgf4r/gedivazukovovo.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607149543ffe9---98102099153.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/rh2ddr05e33n2313a6f20tlc6i/85470931080.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/2977890040.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8d80a69bc---60254310973.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/86989124381.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/88449424712.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/0nnco6n4qu1th084ujc1r6089g/lonetajesorigewebasotegep.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbffe7d66dc---fofimokawovoz.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/tabokuwozipixopagekuli.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/qvpdu3r9d69andqlneadi29e41/55635256832.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd8885fcb9---baxepizadamodubavixito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=12+tbsp+to+cupsPDF 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_off0000ecea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 10044 bytes
SHA-256: fc6f06ab6dbd155e017c38efefa39317557136d04b7c44325112ba4bbd918c8f
font_01_sfnt_off0001033c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033C 17288 bytes
SHA-256: adf1746573e023cd16551b247ff076b9b54d0646d366d0156c84e70f5c742b22
font_02_sfnt_off00013051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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