Malicious PDF — malware analysis report

Static analysis result for SHA-256 34053c4d2da8a527…

MALICIOUS

PDF

83.4 KB Created: 2021-08-16 16:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e8a6fb1c7ffe4b4a457bfa1ea5a329c0 SHA-1: 21ea1d354f224f88e7e600cbb6eb53843010be83 SHA-256: 34053c4d2da8a52756de524a3e595519abac25bb0a322cf593c116edf66257af
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute further malicious content or phishing pages. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection and hosting on potentially compromised sites.

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://argentum.com/wp-content/plugins/super-forms/uploads/php/files/u83bceqo28vdauise39eghnvi1/toremageluw.pdf In PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a39516bac---85792967434.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16107f97c601d8---78888336704.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b85f9d2989---74073477566.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/49113898907.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/65795009211.pdfIn PDF document text
    • http://shosholoza.de/file/bipofaseratazoni.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/72264401684.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/cae00418966b312f3c34af256fb221c5/xuxuxevupezibarepozojizum.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/zelekokewerafunonimufek.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/bososodefi.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085722421a10---dubudewumuruwuvike.pdfIn PDF document text
    • http://ligneus.hu/upload/file/12223553213.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/lixanezezonupofodi.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf17b83b56a---96906008150.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/6442052325.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a33372258e---vunatazid.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/12558457821.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/vunipusasopazuxitola.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/mukatiwovijosikokuj.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/17325138888.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/39914259602.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/tulurowosuzefawesexefiv.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/jinirerevozapibawukefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=money+glitch+gta+5+xbox+one+online+2021PDF 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_off0000e333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4A 11020 bytes
SHA-256: ddf73608f87cb9f2989bc9186d3f9e9a8418803ac2c8c2d6eb7ea896774739bc
font_02_sfnt_off000114fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FE 16068 bytes
SHA-256: d0423b9557964e0442afa9ff653c641c616047999fb1cd0513cc088a510db4a5