Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5bd0058b48d78f7…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 13:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2cb555ae2ac2febbba06a363ad36bed7 SHA-1: f9d820b63462d14a4d40d77e856cb5f3ef1088d9 SHA-256: f5bd0058b48d78f79517834444068c677ec9b4604c2f4102aa910e08143b64e6
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to obscure malicious destinations. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The primary attack pattern involves luring users through a seemingly legitimate document to a network of redirectors.

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 http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160badb2003e20---74319815076.pdf In PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/rf6et49g155a5npob6ar4kmgr5/7843901839.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/86132051236.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912d41a2c1c---86956985506.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/maniwijerimaxetididero.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/funajisiwirulasafibubesug.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/76657407882.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/68718080301.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d7dc72ea0---losasezulowis.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceeae2221b---vanezepe.pdfIn PDF document text
    • https://akvaguru.hu/user/file/39057731377.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5dfc96bc250c4dd2e258f92bf0a747d4/fupizobudurexo.pdfIn PDF document text
    • http://sigep60s-ncbeta.com/clients/44785/File/44624552617.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/ae4d4848c6fff0196f743ec0fa93556d/9446876988.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/33885528327.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/bacbf78341aafbe4cad063d0a56e6f30/39403044974.pdfIn PDF document text
    • http://coffee33.ru/archive/file/23287494453.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/kemadi.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1981b3eb8d---73725696674.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/wanirokogakuwem.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/gexekab.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608844eb73111---62279147603.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5e48c5ea---84931781459.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/tewutavasodujojoxigako.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/99023069813.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a8d5030f7---26084531367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=organic+chemistry+spectroscopy+book+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_off0000d6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D5 19028 bytes
SHA-256: 623179493e1e47994a4bc366f90fa824347d254e7eecb007287e18e8e0bb2ceb
font_01_sfnt_off000108cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 11392 bytes
SHA-256: 3bcae4f3fc374781f95e66ce2186bc8b488680a11ba50f4d5797d911049a1be0
font_02_sfnt_off00012323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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