Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe951c90d832f45b…

MALICIOUS

PDF

79.1 KB Created: 2021-09-09 19:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b9036c047d10edeb7fb2856e443e4b0c SHA-1: 9b03f597691357b2e94a924d1ded46a4ab365335 SHA-256: fe951c90d832f45b5ead56c0206f0ec8720d834a9f27b044e7925b8d3c30dec0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and a link farm structure points towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://studiotecnicopinto.it/userfiles/files/50366633504.pdf In PDF document text
    • http://murito.fr/ckfinder/userfiles/files/tubevefasidoriwixezivo.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/tuwodezumapi.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/47614017444.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/jixolise.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/toninimadiwadab.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/bugenelifejopuluto.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/51bd4333527431502683fdc9994463d3/bixejisutuzipexapuxo.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/75890692310.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/41722195555.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/88643118785.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/gafijeduti.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/pisemovegubaguli.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef7ef3a584---64202277002.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/56520187009.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/tuxupojukuzebizurilawilef.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/39412829285.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/d6qp15p1m1r77scdq3kk18h517/16223407522.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/difolabukajiro.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/96500962834.pdfIn PDF document text
    • http://medica-brno.com/files/55539172309.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/18236428613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=popcorn+time+apk+ios+2020PDF 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_off0000ce8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8C 10824 bytes
SHA-256: 337d1d92359ce493bc7e713cee402e362932450424e2844058fe55e2d349484c
font_01_sfnt_off0000e795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 18104 bytes
SHA-256: 7fb42fed7545a234503d6eec5604a309c4aba00bcd60d50dd0c90c1d9c82aa70
font_02_sfnt_off0001169d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1