Malicious PDF — malware analysis report

Static analysis result for SHA-256 54da89ab8ea50b97…

MALICIOUS

PDF

74.9 KB Created: 2021-09-11 01:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5cdf96310473209f0c62d63001e94f44 SHA-1: f0468dfccc07c72886cacaef49cfb5b84fc0a9f3 SHA-256: 54da89ab8ea50b97c14ad383e11342ab6338a0ab41cacc2b8909ddf8ff491c89
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to various domains, some of which are hosted on compromised CMS platforms. The primary function appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=galaxy+phone+backgrounds PDF link annotation
    • http://thsport.dk/userfiles/file/lovekapuvokeni.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/44860972799.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/22800979529.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/jadojuj.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/30054092020.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/wasutimodekezedotani.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/ravoj.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/42124482845.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/pigodeju.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137534ab7c72---dafusifajirikajesi.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109100902259627.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/45170609268.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/demexuloforedawuxawobasi.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/30986157235.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/buwoxuvoguwudenefo.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/xurebaliwidazuzukusepe.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcead0ef01---sosupejat.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/sukufow.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/xoxiwinogotiduzasofogame.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/lazopefafebenolofutekiza.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/xawolofitunafifutapaki.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134e54c2e2c2---14672564432.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/zofatipilud.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/4338085427.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_off0000bd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A5 17628 bytes
SHA-256: c468208a42ab46888e4202e349d0f23a18ed991eecf4d98dd356b349b818b703
font_02_sfnt_off000103f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F0 11192 bytes
SHA-256: 3ea5a3bc7d93432b389bdfc56cb0f887a01f3a9c9afaacf5acab16a430830081

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