Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7cc8405493ca56…

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 22:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 131ff2d027431b239fe829cb8aa5bf5f SHA-1: 1ada1dc2c841d222b4e97ef2fe5ef5b06b68e573 SHA-256: 4a7cc8405493ca56efc6f2783d191caf3de605c37a8230e1950c834456a6df6f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classification and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inwebjor.ru/uplcv?utm_term=saving+a+word+document+as+a+pdf PDF link annotation
    • http://rainternacional.com/userfiles/file/zuxifizabanilobipumume.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/75105331268.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302410b0748---jedigenozepudivi.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/lifotataziwapusupojorovix.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134a57306341---volawebuzek.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/10258491733.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/vegokiloledinemini.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/q3qrljp400375h820k4gqoklv3/webimevunivukelinig.pdfIn PDF document text
    • http://thuannam.com/image/files/jabakofid.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/pujokavepagonaz.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/fotogivotekipoxigaxa.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/5672395964.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/37658449053.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/zetuduxanuxuvosanola.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/67552809158.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/gukurujaja.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/41957210582.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/wefadogetolene.pdfIn PDF document text
    • http://checopharma.com/upload/files/bakomuzotalipowup.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-6/20210906123146752964.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/93342109718.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/wokif.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/zumedupora.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_off0000d239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD239 17264 bytes
SHA-256: 46827bdb1c10a9a11abba672c78d209e781a7f89c7b8a55fc1b99fa34a41dda3
font_01_sfnt_off0000feb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C8 11244 bytes
SHA-256: 5370b77f0580ec006b23d8a1a035d1086ed801cdd50884bde4fe9d334788c43b

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