Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1a55576c19470f…

MALICIOUS

PDF

81.7 KB Created: 2021-08-20 00:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 57a237af5a9f5b68fa1698fea9f626c6 SHA-1: 0935290c253074f4f9821da6a0ae82b6360e84d7 SHA-256: 3c1a55576c19470fe743231f375c1fd21c50c0fbaa0d5884b03e27227c96ed59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDFs hosted on compromised websites, suggesting a phishing or credential harvesting campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16086ce8f1af55---9872691970.pdf In PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/2635316fb2a6ce33bdd5ef18d4da72fa/modivenapixidenap.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/6636940745.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/95754510822.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f785a06838---losuwarid.pdfIn PDF document text
    • http://htygroup.com/upload/files/32039557919.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/papipikejoxodi.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/40089381757.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/34665872309.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/31519888881.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/52796161745.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa62b518ca---xudajazijemolovomudano.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/87844208030.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/17908140682.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/witiveboxosimiwojefuwipib.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0ii5ilennjrlqdhln8jplqe7r2/tekudobo.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/36344526853.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609f32a02f49a---zobabifoka.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/ditexekoketumegido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=fundamentos+de+administraci%C3%B3n+financiera+j+fred+weston+eugene+f+brighamPDF 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_off0000d463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD463 18192 bytes
SHA-256: 76013ac7247e67a02e23c6325984257192ff923106655c368abb052a05cfc112
font_01_sfnt_off0001034e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B65 11448 bytes
SHA-256: 9bbe1bb52c7710ec4ea611d7be206aade3857eef65862436de0b0b391b245c82