Malicious PDF — malware analysis report

Static analysis result for SHA-256 5929dad5bbe5366b…

MALICIOUS

PDF

97.2 KB Created: 2021-08-12 17:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 5b68ce05e8019e21836f521587e6ba0c SHA-1: ce5cc386ad84bca621be77425a3f34bdfedda5a0 SHA-256: 5929dad5bbe5366bcc37abdb08f3cc3c1aa39803b2e67a35417c217f2a8b607f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://alnahamgroup.com/userfiles/file/22537243943.pdf In PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e702569a---dibejuv.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/bojuwenixifujoleriwujatu.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/b3ba105036d41c8e610f685746d920dc/98323272327.pdfIn PDF document text
    • https://x-software.cz/data/file/xozogatup.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d67f7d37155---52187680383.pdfIn PDF document text
    • https://corghialberti.it/file/sesaxo.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/gvab3dqi68ja4tvj9iv48rc0qe/91354523022.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/5l3n814dfal6j8u74kbgr4htp8/33517662443.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e405229f2---dixuwepogeri.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/17269589717.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/nedufuv.pdfIn PDF document text
    • https://unitjaya.com/contents//files/63056686890.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/67903319182.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/93589111596.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e55a55fe3---lukavunekedanoga.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/zudawoxuv.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/fiviwirezabulojoribilakow.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/dodipotonujubajevevax.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-7-15/20210715223130137397.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079fff23c3a6---86561878246.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/wedomefuzukov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=power+probe+iv+manualPDF 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_off000115bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD1 18988 bytes
SHA-256: 5afc15b949ab5ffc0085d7b71ec05b9728cc61de88a0d7029cd678245e252f7f
font_02_sfnt_off00015e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E07 10540 bytes
SHA-256: 1e4a38c56240e11412f35ff61331ef9ab851fd015548a0dca03bb62edcbe86ad