Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e4d41d817ccd01…

MALICIOUS

PDF

105.6 KB Created: 2021-07-02 14:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e43612615dc16374db0f5fe916109125 SHA-1: 2d29d83d91fdd6323cd270c7906df4b2c097f082 SHA-256: a3e4d41d817ccd0126a92c30dcd7bc493ff7b2cc58a6b768b709abc15cb38826
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

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://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075132ace6d6---85735285808.pdf In PDF document text
    • https://amd-export.com/site/upload/file/38032322845.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91d395918---4998845027.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/71f6irfs8i0psh61usg3f3q0jh/3880505194.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/cfc567d5969f86a1ec4bb67bb57c6f12/juwemuv.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/2f526fc0b0a87526b00febc6c22ebf1a/53653433630.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc6e2982ac---10391144635.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/6iiqck4n9u71jmlfnhq0bviei6/jugilozasif.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cff33ae22---56656646453.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/66803889696.pdfIn PDF document text
    • https://anaksemut.com/contents//files/72630004395.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cba87c8b94---daremasomeloni.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607afb5f28967---vijojumuromileta.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/d7de93e1f4c56306852cd79f3c905799/xozure.pdfIn PDF document text
    • http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/nubina.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/aef90f51b5e6d404961a013d8e011eb7/rudumumilosakexaxuvageta.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160996bc72ce85---pojunusejexefuwaguk.pdfIn PDF document text
    • http://iwishop.hu/file/23116315413.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/t6185vgrp3ebg46mkpoaa4kanp/80600421523.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b12bb5da0ac---96783565076.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a040c580806---68905587287.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16090714303ae5---bulabolorarilasejafos.pdfIn PDF document text
    • https://mvservice.it/file/kagugotutasoluxevoruvemem.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/5jf10170qe5j83f7jc6iahtp92/44786955085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=s1mple+steam+accountPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B9 22484 bytes
SHA-256: 4c68312a96390ec220f246dc7f634cc2c14649e255b7a4fe9829ae807b4a4a6e
font_02_sfnt_off000153ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153EF 10568 bytes
SHA-256: 22498743db527db9c4cf4e29d636acb35a938aa43eade80d5f9f0a25943a5a51
font_03_sfnt_off00016c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C1A 18144 bytes
SHA-256: 1fea96ae78d78fea44414e2c384adb22f34e52b6c49ab9055cc8ded4181135c8
font_04_sfnt_off000188c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188C7 3416 bytes
SHA-256: 40100200f2a4341ed5a68de5b0de7cefdce20dfa98276e97a8e8d81758dd9fd3

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