Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0746772dba2f810…

MALICIOUS

PDF

73.1 KB Created: 2021-09-18 23:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a565dc92acd5ac3fc651234675db0908 SHA-1: ba49a1a18d801a0c1a4195862b6a4b1701deed89 SHA-256: e0746772dba2f810b0e5632645073454a4554f2e7302198d9b72ab6ebeecaf45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs and a link farm structure suggests a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL patterns point towards a malicious document designed to redirect users to compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://chcial.ru/uplcv?utm_term=starting+strength+routine+pdf PDF link annotation
    • http://doorsatyrau.com/ckfinder/userfiles/files/tikabit.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613362d7c205a---sosanutavekunos.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/4370745463.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/pipuputiwuxufularalamulag.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/panudufimalefowumaxovejen.pdfIn PDF document text
    • https://iohrp.org/f_files/files/sojuzuvabamizubam.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd2aa4f30b---59556422594.pdfIn PDF document text
    • https://tepihtrava.rs/files/gemimole.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/disesuxo.pdfIn PDF document text
    • http://kaies.cn/upfiles/210915212036647865yvtnnt.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614229402665f---nadobafijukufu.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/59825575065.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/zozukoweninup.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/zutofebegaxijoxaxozekugo.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/fobotizefegixorabobisupax.pdfIn PDF document text
    • http://seritour.com/rsm/files/71483863047.pdfIn PDF document text
    • http://afro-safari.com/upload/files/42321564859.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/zajik.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613441add707f---3927592702.pdfIn PDF document text
    • http://enricobarraco.com/files/73817927999.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/11/4815509840.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdd5dae460---9674850468.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16143b46a473c7---60604084141.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/vedotijinilavuzajabax.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/zupuraj.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/dobewadurosepefa.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/xepadovanivabulisijag.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_off0000bf4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4A 10904 bytes
SHA-256: dcfb38ef929746f054ca31c7206abfd560d5b85a63fec17a4c973df2f636e5ae
font_01_sfnt_off0000d835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD835 15152 bytes
SHA-256: cef03901b804b117490760c0cca51c0897cf337417877bfe28cfb3139f479b7b
font_02_sfnt_off0000fe71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1