Malicious PDF — malware analysis report

Static analysis result for SHA-256 de39d2c137f414f3…

MALICIOUS

PDF

166.6 KB Created: 2021-08-22 03:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: babb37bf3a9e8ed73372702054bece74 SHA-1: 16ebe7c9c4a1c5f3bd2abf0cd57543582ef9622c SHA-256: de39d2c137f414f3a4a04ae0c0f83fde505fc8cca20842f3a95cbef4e3604b06
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns align with a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9706

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 http://apsara.ru/userfiles/file/25781950132.pdf In PDF document text
    • http://turatabor.hu/media/93048183457.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc561417b44---jisurumomopifim.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/30888121416.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/kuwukusezejuvaxales.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/pixofexoxu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16077b04a99163---87428918852.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/08edee4f228abd07e1fa9c9e7fb257e3/bufitovegukokepuredesut.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e3d7548fb---dujokozoxara.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb7b5927f4---gukenapibisajudiza.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/fuxikutekinewumobisovevi.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/be31b973c50fffe27fbe042baa581a6c/negupixoluruvipatexapulu.pdfIn PDF document text
    • http://vkts.se/userfiles/file/69321276643.pdfIn PDF document text
    • http://redactron.com/userfiles/file/80667199534.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106425920e3a---tuvugukaxo.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/sokewutulutekojulitigebed.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/96019fe18949c33e965e42dc6c6335c6/wuponajila.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/goxemifebudi.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/pudevekoxo.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/42605049604.pdfIn PDF document text
    • https://ckmandarin.com/uploads/77595118846.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/vebiziludaka.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b3d121080a23ac5ca23313ea5fa818a7/82828804574.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/fotivu.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/57077727974.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ofmt05udvrqesmm8jaisprmkbu/13868799644.pdfIn PDF document text
    • http://b��sica.sep.gob.mx/dgdgie/cua/siho/startIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=actividades+para+ni%C3%B1os+primer+grado+de+preescolarPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20FF4 11108 bytes
SHA-256: 11a6e85a6f3c9d677aa1bc593cdb07452cd3bfee237a78f2eba5642b3ca88957
font_01_sfnt_off0002296a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2296A 16244 bytes
SHA-256: 4884618b97b39fa9ba92bc0d41cf50601b8da7490c6c48ea2b610802db5ab6c9
font_02_sfnt_off00023f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23F6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00025780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25780 19276 bytes
SHA-256: 7c238c22bd5e4240e52d4e153ba1def750a562e0f1a68d01667169fbaf5d3e1d

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