Malicious PDF — malware analysis report

Static analysis result for SHA-256 566dfb3ea19e1d11…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 03:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a98ecf9b76e130527bbe04db2c45acfa SHA-1: 9566bea54293db93037ce4b796d3875a2bd8eae0 SHA-256: 566dfb3ea19e1d119715a972a0fbb537be85dd632ee292cc716d4d771f84823e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a password-protected archive lure. The PDF contains numerous links to external files, many of which are hosted on potentially disposable domains or compromised CMS uploads, suggesting a distribution mechanism for a secondary payload. No scripts were extracted, but the overall pattern points to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://bright-mineral.com/uploadfile/file/2021091607013793.pdf In PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/toxolagororiw.pdfIn PDF document text
    • https://777mto.com/contents/files/labosegufujakonofobizixif.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/78407280293.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210916065250.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/5114059460.pdfIn PDF document text
    • http://anpo.vn/upload/files/sikanojagitotufexomajazi.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/pomem.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/saxez.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/toxodurifekis.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303f725d8d0---3246365517.pdfIn PDF document text
    • http://1carl.com/userfiles/file/43568429430.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/fekoveluribopebomekuna.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/85819249307.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1614137d2166be---bezasopelulezujetina.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/58946080544.pdfIn PDF document text
    • https://laps.pl/userfiles/file/puzepaga.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/maduxu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f25222b234---bagironejokifonomem.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/85061961791.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/bogomesitenora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+deactivate+sim+toolkitPDF 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_off0000e0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DB 18288 bytes
SHA-256: caab39ff8dcecb0e4346f08a3988aa36a87ae32f85ff9b8897d698d8a095f093
font_02_sfnt_off000128fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FE 10564 bytes
SHA-256: c129d25f6e9cec834681342ddf959ce38fa388059fc13912ed2f5c9d9cc57812