Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf936787a2059d6…

MALICIOUS

PDF

86.7 KB Created: 2021-06-09 16:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 86ed79859ff56374ce68b389ec7f3ae5 SHA-1: e99bd5f4f9792648d758703b062458744ec10dd0 SHA-256: bbf936787a2059d6730d3083e249abe270945923f9d46a8501efe77e32b6bbfd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, likely intended to lure users into downloading further malicious content or engaging in phishing activities. The presence of 'utm_term' in one of the URLs suggests an attempt at SEO manipulation to attract unsuspecting visitors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=how+to+get+capes+in+minecraft+pe+2020 PDF link annotation
    • http://e-hane.com/files/gopenapuji.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/wuloda.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16077dbdeb8a30---tibivesarizile.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/pexudejafivafusitofu.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083f036486b1---kujaxobiweluziduve.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160800a4b4f024---zujilip.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/mj0d2386ea6p5o924tl55f8iuo/vukitiduwobulonoxu.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/zunufuluvajalana.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/d7434b8d3e7095ea9db2cb767d1ea405/fusosowepewosuvafev.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc5c6f35d1.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e14348dc0---52796925544.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/xinodedoxosuzepomab.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a50a9b010e---xuwumebibinoritetujat.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/69998254347.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/gazab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn 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_off0000e92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92E 6872 bytes
SHA-256: 16d5551cbdd1ed6bfdd4a604036df069261641d2bb1159a4c2231fdf51d9dccb
font_01_sfnt_off0000fa86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 5628 bytes
SHA-256: f8cb05cd538e63edd2eeec524bc8bccdb82a6d9ad1f033b6b8a943c5c1be1f86
font_02_sfnt_off00010db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB8 11608 bytes
SHA-256: 89e37508233ce819e4141af46b0f677a73ca5ae563f977cdc19924e11c21f1cd
font_03_sfnt_off000135ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BA 16192 bytes
SHA-256: 551ce2c9ed88968644f5e224836889bc5dd40bfb2ecc50e9ef60f439fdd79fd9

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