Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bf0f2f85abdf1d…

MALICIOUS

PDF

74.3 KB Created: 2021-06-26 12:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 665500ccb9acec7f781c108353676320 SHA-1: 53ab6ed39439cac4caa0b4d5e0b7d9d3f265f9b8 SHA-256: 16bf0f2f85abdf1db76db048788ece794dd0d304cb3a16e513189f4094febbe2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points towards a spearphishing attachment as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/h61c7rvu1su415g5rko6jkh146/wulumido.pdf
    • http://www.anclupnapoli.it/userfiles/file/72977172288.pdf
    • https://euroroma-bg.org/files/file/52671204865.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160714491bcb4c---gavam.pdf
    • http://teenaramainc.org/clients/875997/File/xudugefesubenesogero.pdf
    • http://pivotal-technologies.com/userfiles/file/getevawukegegeveloto.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f027611695---jaduzoxazi.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f36aad100---27051609588.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/b2h3rf41cm2kvka8b1eaojdmo1/40199066765.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c92a36eaab8---wugokes.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/1e42e96d4ff1b9e8c9a3a74ffc28a98c/vifisaf.pdf
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/dovipuruv.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/11d922d3d07c34740f7677c2c82062b6/29041839526.pdf
    • http://www.serenissimaservizi.com//files/18826914858.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccd40e4ff5---98251050274.pdf
    • http://smitheaster.org/clients/861344/File/48399080432.pdf
    • https://autoroman-service.ro/imagini_ws/fawejafogapapaf.pdf
    • http://apexnepaltravel.com/userfiles/file/tiluvubaberedorudapazo.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/46dd8f7bd75cb7ef4f8a0c276dd06e84/rikusalixukawo.pdf
    • http://sparan-art.ru/ckfinder/userfiles/files/degegigawosuk.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab102bb805---ladowitalozibupab.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1817f2aa36---71193673683.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb9cf900d5---totemodekugug.pdf
    • https://presstone.hu/userfiles/file/60656863888.pdf
    • https://alarouba.com/ckfinder/userfiles/files/32808638317.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=read+game+of+thrones+online+free+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c14f.bin
c10abecb2b7410c579fd119eefe4398f01f897f74b54304b4ad9fc8302cb38f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xC14F 10992 bytes
font_01_sfnt_off0000da5b.bin
243c76a990b1a8db472c82f7f9215009aa11db56e6ab094344a985c904a9e8f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 16120 bytes
font_02_sfnt_off000103c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 16792 bytes