Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80463762627718c…

MALICIOUS

PDF

70.9 KB Created: 2021-09-24 15:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05e057360f46fef6e3f3600b71fe592d SHA-1: 10e984b0dbbf55b8ee2abca97f4dc4665160dd4a SHA-256: d80463762627718c76992dbc5d50f1215f4ae582ddbde5bf027fced467361c79
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also includes a link farm pointing to external URLs, some of which are hosted on compromised CMS upload directories, suggesting an attempt to obscure the final malicious destination. The primary function appears to be redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://et-auditing.com/userfiles/files/vopewegikepubevopa.pdf In PDF document text
    • https://millinerandassoc.com/files/file/lamenirowowunebeveladodo.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614098d6c01a3---jajepofibidekisujuvebebos.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///debazevuvunenojin.pdfIn PDF document text
    • http://goodnest.info/tctt/sites/aaa/file/losixub.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/59663299384.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/zupeke.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/vizuv.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109030451293501.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/4tjouurcsv724jmg4nqn6evcar/31264567360.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc36ef184a---zipovubijirojazarekopuket.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/sozonawawe.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614db3516b86f---39635814611.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/34250283114.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/wevadezodavegodixililop.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/felul.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133460fb48ba---4354102252.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/56871399819.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/1299072524.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021091720143273499.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/retagasetebuwuzuvas.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/26959706789.pdfIn PDF document text
    • https://kralpin.com/calisma2/files/uploads/64153273224.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/vudoferekukor.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/55588306259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=kimetsu+no+yaiba+movie+full+movie+subPDF 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_off0000b4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0C 10684 bytes
SHA-256: 1528f008c6fdac4a652c7abaff4c111dedecffd61921d06d634e6758b7622c6c
font_02_sfnt_off0000e5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A2 15800 bytes
SHA-256: df2245957d43bf8f29f1400d2a8f1a94aeafd63908b205288589cc1d696cd63e

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