Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c237690bbaa9ee1…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 20:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 52e71cbeb291c0c5794c191d4945020e SHA-1: d5d3de44c3abd793ef6b8a55d1ac6c51e08e6cd9 SHA-256: 1c237690bbaa9ee1dde6508425247d118663e4143fe6660d7db956def2f4fb0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised WordPress upload directories, indicating a phishing or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607069fccb7e8---wuzanomexewewuj.pdf In PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b618c0e58b6---mabik.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/butakexesi.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/zonojizexovokevixopofuxam.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/9c1982ffa9c17c68009cfef815a407da/69884342328.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/dodaforumimugimefamelidez.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/99466353280.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/fe801e115a3b54bc4005e0c241dbf556/20942567784.pdfIn PDF document text
    • http://askort.pl/Upload/file/4362582716.pdfIn PDF document text
    • http://fullx.net/files/gusakifigi.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/rakidajekibafitafiwaw.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/32131848d6f1a713d467b8f006f495a4/98526604448.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/simekunuxa.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/33366629208.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f36b3e2f47b---25469362376.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad5234dbfc---32530403720.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160758120a5e8b---35944183497.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/loluwot.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16129f05c6ae65---fojit.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e3127d55ea9---mubugegur.pdfIn PDF document text
    • http://giustofiori.it/file/75934366198.pdfIn PDF document text
    • https://slide-bearing.com/d/files/zubifufipabedololen.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/satokijuzigonanup.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/40831233387.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/196895ae313fa4bf9170b217e1e7d4f5/59637104574.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/muxunusamaxero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=peavey+vypyr+vip+2+manual+pdfPDF 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_off0000cefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE713 10672 bytes
SHA-256: 91e6f9aaa2672ccc92401f5346e5b944f19d93ccd0b514b320222b0b424261f1
font_02_sfnt_off0000ff82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF82 19024 bytes
SHA-256: 58d2540805ab7d23334a80c4b6812139d50d520300d35041eadf92f47f3c08fe

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