Malicious PDF — malware analysis report

Static analysis result for SHA-256 877b58796e9a8dd9…

MALICIOUS

PDF

86.5 KB Created: 2021-09-04 10:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 91d4d762992f6706baf02800f367a242 SHA-1: b22e298cc0481f7eb7a35cda00b4fb85ebb90871 SHA-256: 877b58796e9a8dd94e47dcda4bc238f72abc3fcbd1db60427bed2002b3d0d878
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, several of which are identified as compromised CMS uploads or part of a link farm on disposable hosting. These URLs likely serve as lures to redirect users to malicious content, such as phishing pages or malware download sites. The PDF structure itself appears to be a link farm, a common technique for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://philabc.ru/uplcv?utm_term=fourth+lateran+council+pdf PDF link annotation
    • http://acecaalcoy.com/userfiles/file/68182575235.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021081706292073499.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/52344597276.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/xubofotinojedowogumetavo.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/52162540176.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/40439689045.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/rfgabrs1reat576nakl4kmothn/duped.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/21c548fb9bbf49e09deb3491c400612f/mepokonuke.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-20/20210720202041850075.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/54666763559.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/pejezogapenexexokulozaroz.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/16838376093.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/33398150401.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087fcad36f4d---71430321489.pdfIn PDF document text
    • https://verner.lt/images/files/63980131261.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/gidowesirupafegetoguwa.pdfIn PDF document text
    • http://soles2walk.cz/data/file/xubomisitiripi.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/72906352794.pdfIn PDF document text
    • https://drsaman.com/files/20579261968.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/1df5a1abf72812eb1e818ebef98a50fc/52949903955.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021083009171494.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/5650746939.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_off0000ebf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 10624 bytes
SHA-256: 8e9290eac00b297259cad5356ac5cd31bd5e062783745bf8936b1f8c91e52a66
font_01_sfnt_off0001041d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2F 18704 bytes
SHA-256: d80480bd42d160567364e43161c732c6db4032521fa1793fd7113909998f840c

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