Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5710ca0e2f29d4…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 12:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: afeadc29ef5218dc11708dd86538a4f2 SHA-1: b8875dcb95013a5172ce31720555b16b874e5ecf SHA-256: 5f5710ca0e2f29d4add631f9c4d0d523e4c90685f9d21167ebdca30c3f181d8e
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by a machine learning classifier and ClamAV, with the latter detecting it as 'Pdf.Phishing.Trojan'. Heuristics indicate it functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://portalbime.com/UploadedFiles/New/file/75122623796.pdf In PDF document text
    • http://arenabilardo.com/data/_files/saketufi.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/fesikiwizejasukuwisowap.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613527209d81e---42310074084.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/texuzuzir.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/wivitosulevato.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/pijuloguviwomovutara.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/sabazaju.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/28752140210.pdfIn PDF document text
    • http://skisun.it/userfiles/files/zisiderevikadonitepuwuf.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/26426020766.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210905190155.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/goduk.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/fugibuxejupolidol.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/74741062627.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/16340468502.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/807vrq1vpad5d7f6o05660saf6/33463941268.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/5b3e9e85dbd49ba8528522b6e5414164/nupesadomalunanufomu.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/81310657076.pdfIn PDF document text
    • http://rinsacars.com/files/others/16718764422.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/xazotaxidivipewosod.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/zozakeni.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613af89e446b1---wolejebu.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/xaxelatevop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=extension+adblock+chrome+androidPDF 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_off0000db1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1F 17624 bytes
SHA-256: 7f5d17346a6df3a8ce235df48d362d73addae6259edf8e383d4bc0bb1c45ce06
font_01_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BC 10952 bytes
SHA-256: cf82608fbfcad14c9adb3ab0a2cc38f5c25e1af56cd3366a2d90d3829e51df4f