Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6180c53e7ef4f24…

MALICIOUS

PDF

73.6 KB Created: 2021-09-21 04:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61aeab86b63981d3f873b35597a2b199 SHA-1: 324c600858b0dbb8291fcf907327d0e5fa18bb06 SHA-256: d6180c53e7ef4f24f4d7dafd48c2eaf2022650c090a0949088559d260a15b6ea
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable or compromised domains. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://0932018255.kad.tw/kads/ckfinder/userfiles/files/77614495407.pdf In PDF document text
    • http://crocepadrekolbe.it/userfiles/files/nojaxufelemafapezi.pdfIn PDF document text
    • https://ywint.com/ckfinder/userfiles/files/1631991202.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/gawepipominefefog.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613230570efd3---20040755571.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/612f2dc2c3448.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/sorixejexepozetore.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/sidolaloxexaxowosidufu.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/nubuwinivigedonumem.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613888802b09b---suxuxumebigisan.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/57123179992.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/30066267711.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/nutoponaperovifawag.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/99688236889.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/jifimikamuvujerupixob.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/baa7884edabf0a2bc30bc0d70ab8b093/tonamipivefesituran.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/godifabiw.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/bixanakosuxekefas.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/56230292494.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/11416963280.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/32727831228.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/24690456178.pdfIn PDF document text
    • https://eventaipei.com/upload/files/36838872291.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/vemux.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/petejezewanawafabovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=vodafone+egypt+apn+settings+ipadPDF 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_off0000ba75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA75 17416 bytes
SHA-256: 88525b5da18cf87526f4c1d81f82c000aa301014530faf8a0d1a56f58f93bbff
font_01_sfnt_off0000e834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001004b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 10608 bytes
SHA-256: 236d2f93ce2d84f242453d4ddd062a1e3d88ccac2387cd5caf6fc5aae085cd66