Malicious PDF — malware analysis report

Static analysis result for SHA-256 273e913d52f3c8a5…

MALICIOUS

PDF

91.0 KB Created: 2021-08-10 23:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5072a2477ee71cfd59d6edeab06c66b9 SHA-1: 16e353226dac2a5169e208267442ac4463266261 SHA-256: 273e913d52f3c8a594ff8b1cbc5cf34fdd70d2a8b039abf3ccccc969e92e9869
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, designed to redirect users to malicious content. The presence of multiple links on potentially compromised infrastructure suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c58e5e4d7---japikojapigukugi.pdf In PDF document text
    • http://consol.hu/images/uploadedimages/file/98918834931.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607694f32b4c1---43198788991.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16211125036847.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/77895618523.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/b731c7ccd449deb1ca87eff2e3aad70f/welolikikekokugofejobaket.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/98325988393.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/zowewijefufajes.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430001420541041.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/kusefavotal.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/79565711505.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/1519358261.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/55782984324.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/nilesajalozujixalojaxo.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/5283a5f41f88f70a4d87f13e08b3db7b/butojalepox.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/67k21ulpbtkcclme2bleu0jtsi/bezerom.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/87376595287.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/32653998743.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/numewaxivanepix.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080e07890acf---64970190519.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/97120784611.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c67b01b88---jipali.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f13c314e9db---rakonuzaworunekuloxebawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=propel+star+wars+t-65+x-wing+battlePDF 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_off0000ffe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE5 11092 bytes
SHA-256: b1d2a5a7f185e32f63a4cd51490b395d2313795fad18f8b94e0e53b51f8683a4
font_01_sfnt_off000119d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D9 17024 bytes
SHA-256: c97fbc77ac15f5ddb05e714ec607c496956f20680e75639c7086f010b158ba85
font_02_sfnt_off00014664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14664 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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