Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6a4ccfaf313aa0…

MALICIOUS

PDF

71.1 KB Created: 2021-09-17 21:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1b9149921f7bb20c625879561329cba2 SHA-1: bf1f57f86b85b7281efa11d47f4b2b85b36d6346 SHA-256: 7c6a4ccfaf313aa0bffa8f0a851195bb722f9ba85282db4f4f8763b3630c1f7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised websites and link farms, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=wabi+apk+premium PDF link annotation
    • http://www.civilhospitalpalampur.in/img/uploads/files/22677724258.pdfIn PDF document text
    • https://ntc-container.com/upload/files/67507404307.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/rojaxepalevokolitalorix.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/22066928587.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/41422923573.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/68728461122.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/gamum.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/36969659017.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/64503301083.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161411794a1478---82379756484.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d13bb12697---pojuro.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8184a39b3---35948230862.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/51685528189.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/xivijapagugogepas.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/dasajoruzibo.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/69628230407.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/fodepalowudizazitemu.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/depuped.pdfIn PDF document text
    • http://z500.si/files/28567487034.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/87452500649.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/97934332602.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210914_6AF4A6A4CE4EC5EA.pdfIn PDF document text
    • http://denizyemek.com/images/fck_upload/file/91102370338.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/kevesanok.pdfIn PDF document text
    • 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_off0000b567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD79 16996 bytes
SHA-256: a570bee8c830555a1b878aa413e335124dd26a27bea67390ca5a0c13585cf276
font_02_sfnt_off0000f926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF926 10204 bytes
SHA-256: d3d8f6db101eec0de7c7826c1037430beebe8b9b2962f25be0d20f4040fc2db4