Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92bf228dc3fb2f4…

MALICIOUS

PDF

89.7 KB Created: 2021-09-08 07:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4bc8ecb2e434da07ac74dc2d88e34d5a SHA-1: 735ba06c7174ad70b5b55eb5763563b6bc27e925 SHA-256: b92bf228dc3fb2f438cb02413786a09a5c7a1d28577edfb4b56b0f9cb3c03338
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or phishing sites. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of link farms on disposable hosting further supports a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://majubesar.net/contents/files/66942114134.pdf In PDF document text
    • http://boxethai38.com/upload/file/ronowijavegopitilok.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160becd32f02ee---55229822067.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/dotasodevabibirozexax.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/kn6shvil4rcmocjfisg44c1k16/73235083241.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/41996728079.pdfIn PDF document text
    • http://abpaluso.com/upload/file/purowesazizuxusakukibiga.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607792fa9331b---88963991018.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/70528239598.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/mepakigibufofe.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/nhaoo9b2jqljef724te1soplv1/75268172416.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/75764493348.pdfIn PDF document text
    • http://blueyee.com/upload/file/201101439297.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d9a75146e---nugogumatolipuludonon.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/76104222692.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/28706762147.pdfIn PDF document text
    • http://vo23.ru/upload/file/80301576503.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1626873386.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/61823656175.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/a9b773b3aedf0854d5796c2215a4be08/43819520669.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7m8lu5f92mq8kk2msj3d40v3q4/netafidexovodorodifebamas.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/81820647715.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/cf5986f31b48b4e61c14839a00da358b/60714536505.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/d4upnjo538951srdfnf379blk0/dobejuzotafigej.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5bed5ec433---71598001191.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/fijepunimewurigekelisubos.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/13184577347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=puppeteer+pdf+footer+template+examplePDF 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_off0000f5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC3 10496 bytes
SHA-256: d4af6397416d789dee966fb634427a387bf34409ca24b8fc8fe83b6d9d57a17d
font_02_sfnt_off000125af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AF 19336 bytes
SHA-256: 6255ea82d0df02279392b0a549659abc6e06ff6b3f25bf6706f17a251f506879

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