Malicious PDF — malware analysis report

Static analysis result for SHA-256 47853aa85c41afd9…

MALICIOUS

PDF

75.3 KB Created: 2021-09-07 04:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e0d1f59acdedd1c2f735cd68dbb1ce3 SHA-1: 1fc30022a24ca534402a6acccf1f39755a83c928 SHA-256: 47853aa85c41afd95ff2cecc3c5f8e5b8511487ac8c6dc1420c9ee8fef145e5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to host phishing content or further malware. The presence of numerous external URIs and link farms on disposable hosting indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=trigonometry+review+worksheet+gina+wilson PDF link annotation
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/62814246b90c3ec2268baffa10ade1ae/pitajatikadisilanorunis.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lgcsgdtd18gmh43d9e18n17i6c/2825071097.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607edb33e55ba---rozikizugapuvegopalor.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/47389638423.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/19459808826.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/kuvopimemoj.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/wulajixifonalivukububativ.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/57579309385.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a40d2a8711---61422647158.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/15f35dd782265be36b36e252e81a078b/tugasizugobifobofajima.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f243b6b0d66378de905c4f565960d96c/63390643522.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0ok7mh7plco5lq30aks7oijg4r/mubiridoril.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/zaxelepufo.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/duzakuwapusuv.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c952f8d46f---kugavupizebupamajeruber.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b3242124093---66658865594.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/458afad436d11a9b5ef949eba88d6dc8/26752898388.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/nujesajiniwiledeje.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/15621386650.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/42417d588032780203a3749de643a210/daxapiwiruzigexudek.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/ac3ef78a73bdab32d747d3a2a780b56b/dopepunalavatejofilulav.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/bagezabanefegepidorarefon.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/wowivajopusuruni.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/vemafujogesogosewujur.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_off0000c1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AE 17224 bytes
SHA-256: fc032433ad5b7871f9e07d2507f4452a27059e459a37c40856d7a961ca86d055
font_01_sfnt_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10632 10876 bytes
SHA-256: 60979606f2cac59a3c645f2fdd5aa321282ce94883a5df42eb57689ad34fff64

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