Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b0b300bb01bc87…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 23:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e4b2e08e20ec2f8f6a24decb1f1bd564 SHA-1: f6e70c16e58a6a3cef93f3ebad9896cbc8f58a28 SHA-256: b6b0b300bb01bc874ead24a82922982f6a42cea56732350c63e30adddb3ccb8f
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95', and ML classification strongly supports its malicious nature. The presence of external URIs and link farms points towards an attempt to redirect the user to 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://medvor.ru/uplcv?utm_term=diploma+civil+engineering+interview+questions+and+answers+pdf PDF link annotation
    • http://ggled-smot.com/ckupload/files/vabogepofolebe.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/50655307708.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/gokavukodovepuvubutade.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/40611713666.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607819b42e504---mijapubexogu.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/biruf.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f1e9400fa---44671405010.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/sijexorof.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/zitusabenaz.pdfIn PDF document text
    • http://imaginove.eu/data/Files/81736381289.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/btpe1d3jc0m4qmvh62holgu5j5/80124510140.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/c206ec3109844286952e14818d60cb35/54696321020.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/wepabafibepata.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051410502362.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ee8452e7fc62c5c01a614b1dc2647f1b/5025360763.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/72245791501.pdfIn PDF document text
    • http://tion.hu/upload/file/51318277582.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/lasenodugilutor.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1nnk59fcrpv8ma0hfb5q8dpg7j/joxapa.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c20c2689e41---jofotutos.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16133441c4d880---47372899021.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/2jsjlfo16se477r5itogdd29kn/mituwexaponir.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/fb2cd76803d4d38224bc0ca3e23c7ca5/45561837209.pdfIn PDF document text
    • http://boratohumculuk.com/ckfinder/userfiles/files/fuvunabubepej.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_off0000dd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 17452 bytes
SHA-256: 538cb85d5611401372d56d86d7b7c87b69a34ee4609c7286d5788ef554144615
font_01_sfnt_off00010a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A85 11364 bytes
SHA-256: 10bdad467752da4a456be1c1180f8306085f04bbe43fedb65fd0dee53317a40f
font_02_sfnt_off000124d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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