Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ae4917466b7639…

MALICIOUS

PDF

76.7 KB Created: 2021-09-18 15:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 24cd8372da069ebc4e38da96e19a751f SHA-1: bf477478d9337246bb78f6fcab34a4d1d94532c9 SHA-256: 95ae4917466b763974a783c111abc7d9f0373e41af83ac4b58001c51e48357ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://abpjse.news-read.com/upload/files/7340504358.pdf In PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/potik.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea11d204b7---jexefanufe.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/lugituxavifina.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/gafusitilonarezi.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/ruzopi.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/86336924477.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/67629891010.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/46299550933.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1630685602_9014a1ca35.pdfIn PDF document text
    • https://esz.jp/img/editor/files/pasuxawodupegem.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fe9cd3f75---xefebulafuriv.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/70780414192.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/75839414728.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/xaleganorawuxax.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/xawoganavukamowogefado.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/95338940408.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/wagixolovozekimedu.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/62610581925.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e50236d57---kiwonejoweko.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/29662920767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=loc+kargil+full+moviePDF 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_off0000c7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A0 10524 bytes
SHA-256: 5edc35c4d7fd1ca67eafb8e91ff33b817c248deff1067b1f8a0b579d2002a648
font_01_sfnt_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 17768 bytes
SHA-256: 7af61bc7f09753a549c09b1de16d5171a7486d96fe437f84ad65288297f25f41
font_02_sfnt_off00010dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1