Malicious PDF — malware analysis report

Static analysis result for SHA-256 10232e7324cd8a2f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 10:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cee9a7954ea5054f7d08148703858b25 SHA-1: 83ed2c193f1dbbe09769d8287bbcd165ba7100ce SHA-256: 10232e7324cd8a2f96e0ccbe6da7058680e2d570b4c6ee0737c7cc3c0fc20c40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://copingconversations.com/userfiles/file/5951732427.pdf In PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/5388111092.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161344f9e9d257---69746124894.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/podovegerowo.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/tebamizujazidugop.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161394c3fe20ce---mizudagubelokalugavufo.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/71369942815.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/junebimaserapizawigolud.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/33958391007.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-05/images/files/83818388558.pdfIn PDF document text
    • https://tl-systems.hu/files/files/xepur.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/girepepepipijep.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/25365588186.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/vawod.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f441848c38---97179783218.pdfIn PDF document text
    • https://afma.pt/site/upload/file/xeluruzag.pdfIn PDF document text
    • http://semanbio.com/upload/files/sibajovifananuxipuba.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/89484001399.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/samojododunujeluka.pdfIn PDF document text
    • http://newworldss.com/uploads/file/84976547920.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161382ed521d09---35438739155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=download+google+play+music+android+appPDF 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_off0000d790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA2 16496 bytes
SHA-256: b0e859a559cd7f5f9fe715e6792cc193d02ac0b223c96ffc508fdcce5e040b3c
font_02_sfnt_off00011a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A55 11060 bytes
SHA-256: 1e0897110dc1b44b79fbbbf7a49a6557db4661d26dd6bf9f115c482a8e337990