Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03a79e11c97aff8…

MALICIOUS

PDF

76.7 KB Created: 2021-09-16 22:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd62923673aa940057032fd0c1bdaa6f SHA-1: 890dae98b49749eb4c334c5a45469aef020f6a52 SHA-256: f03a79e11c97aff83538eb44fce385c71284447b048179df12fa3596e0d43b06
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely serves as a phishing lure or a distribution point for malware. The document contains a link farm pointing to multiple PDF files hosted on various domains, some of which appear to be compromised. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, potentially exploiting vulnerabilities or leading to credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://guruvinodji.com/Userfiles/file/dukefis.pdf In PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/2cf4lpgllphdn6ojf6j0q3eru3/23965210849.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090110525573499.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/63091250329.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/kuzuzajisomisowosupigiju.pdfIn PDF document text
    • http://domosplast.hu/files/file/21457148706.pdfIn PDF document text
    • http://praguetransfer.com/files/file/pepinorivafubejow.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090411135624060.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/29826501635.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/65745654299.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/muzojirogivudililuposof.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/dabetegarowelanemegofose.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/fufuwovurumame.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/wejexo.pdfIn PDF document text
    • https://parkettworld.com/upload/files/93815663986.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/pavoxadifazugudurojomef.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/7234939571.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af4b04b297---92504744792.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa21d27932---felejovizo.pdfIn PDF document text
    • http://jin16888.com/userfiles/file/lozilusovovus.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/radomeniwege.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/4d7a15002f5766544eb32327ec8a6ac1/35116605382.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/93384127525.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/87304562721.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/63986798662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+secret+of+success+book+pdfPDF 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_off0000ca78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA78 16476 bytes
SHA-256: a7c414c8d40f69210c6c3dfe6192442f5a6df73f584232cc8576402aae3d238d
font_01_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 10608 bytes
SHA-256: 96e2f8072c6642c3467eaefebde2c331fc309e8507772e81aee4ac3a698c4e53
font_02_sfnt_off00010d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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