Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c85e049c755b80…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 06:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 38a19bab6c9e2b45d1579630c8735fb9 SHA-1: 0404b9d11e6885f0f6955640166ac826ab415d02 SHA-256: d8c85e049c755b806ac55dbc35407a638cfd04966b22c4ac3f1d2921870156cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://catamma.ru/uplcv?utm_term=pus+filled+tonsils PDF link annotation
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d5bcd2a13---zewafapinoleperus.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vcb90s00dnguqvoneisj7635t1/kiravisutaruxebotuwuk.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/pivowaw.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/wuwomupunuk.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/j4bnpba589a5c5kvt4rklb8j75/zopabemejoluz.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/44011185065.pdfIn PDF document text
    • https://orrizon.ru/images/file/79615526954.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/mexirosanodom.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/c100ecfb5b6ed8888615e596b5d68fe1/86775565523.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5fa51f48---17616915631.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761bae0e863---ruvesewuzuworejigimijekon.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/c2bshs0q0v1aldj59i94qg7vq1/53434097216.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/kuvifetezutavijoreposug.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/aufsj667hg171d6rbhhnh8lsf0/debugebozonevuzemanawegom.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/45050338062.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf7fd5a5f8---jumodulewolula.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/32868631752.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6ce289404---22588176438.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/81604379464.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/e650526d03c8ea1ef09c1ef2ec9a172a/34840533802.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/majugagaduvuwiponaz.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/velutosuxuputemip.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/gixegidedozakurizafebi.pdfIn PDF document text
    • https://lesura.net/userfiles/file/83624295668.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df97a2d4ab---29284617213.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_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 10184 bytes
SHA-256: a694bf5bc035c95f78ea1fb9c3be134c97093169c87b40df2b1486142ed077db
font_01_sfnt_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 18424 bytes
SHA-256: 3459f9d66a61e22a66c405dd20abb73b8c056a74452d91b4c40c5a7136ecf240
font_02_sfnt_off00012329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1