Malicious PDF — malware analysis report

Static analysis result for SHA-256 09cf65520d81272e…

MALICIOUS

PDF

87.3 KB Created: 2021-07-26 21:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 99f147c8079d9736822492537584cfe9 SHA-1: 62d9132aab75841e9ca282f963ac91d1e3085a06 SHA-256: 09cf65520d81272e7ba20b9ea21b7b31c0571a9665ca1007268f290becd12592
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on compromised or disposable domains, suggesting a link farm for SEO manipulation or malware distribution. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure for link farming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/d72cca84bd3187a188660461cafebf7e/pibosizusikabin.pdf In PDF document text
    • http://thaoduocvn.com/userfiles/image/file/zobawol.pdfIn PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/gavajurowekananelevize.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/vukitadobufu.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/26163806935.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/4uk3sgacqdnime652pob8jr7ot/38560426672.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/wazetofapomiwepafil.pdfIn PDF document text
    • https://senfina.top/uploads/files/11288060136.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/rerorikokonitodub.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/tosubofufo.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16088d5679eabd---55613131336.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d652773f4f---xigupugejonatusisegatijan.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/ledexo.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e3aac19cd---fosurika.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3394be617---41925160005.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608844d3ed984---taniluwidirikisi.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/55247425593.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081550784f44---bigumilevigidobomegube.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/46032567140.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/nidibovejitoxofotu.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/ae37bdbe4f417ce47b0ebbedf47c0f93/89675922972.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/c2cf338a76ca6391612eebe760eac92f/lezugusosafute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ejercicios+para+abdomen+plano+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_off0000eed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED8 10936 bytes
SHA-256: 529c6ae2246bce4373082342659f8d8427dbcfdaf0254f4a6c1fefc4c8452fa3
font_01_sfnt_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 17628 bytes
SHA-256: a8245daf93c23ea1db559a4418997093b199b5956cdc4a545aa60866289a3851
font_02_sfnt_off000134b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.