Malicious PDF — malware analysis report

Static analysis result for SHA-256 e643d7a0a9d8aaba…

MALICIOUS

PDF

73.8 KB Created: 2021-09-25 16:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3cfb9a9f8a04fc7186b6a39a99a809f3 SHA-1: 3b888bba94d52a1c0a89bd8c7d1d6a0d64ea52f8 SHA-256: e643d7a0a9d8aaba9e3a47b4e0465bcb854e0e64f4b2c58327bf387411364f02
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and link farm indicators strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=how+to+draw+transformers PDF link annotation
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144293f713df---61126025077.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/84695523672.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea4a1bff50---videtavimupefonevive.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/14677091856.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/87397281708.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/23821667558.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/38779175d87bf67da6a649318eca0d3b/xugujokudebafo.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/lagegukugovidixamu.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/94919796631.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/46016809722.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/xoxavusejudafuwexofuzer.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/78210135511.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/fulalagupojefomajo.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/xeniv.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/70553887616.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/dobolarigoziruvika.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/94756835230.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/10929918726.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/vafaxotorono.pdfIn PDF document text
    • https://maturana.cl/upload/file/natewatoluluzereko.pdfIn PDF document text
    • https://eslms.com/userfiles/file/91609887698.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/94307704959.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/2932092388.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_off0000b99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B4 10456 bytes
SHA-256: 58c56a3ee7d46f75fd56946a253d33ca618c7032e4e938826e5f6fd3bb8488f6
font_02_sfnt_off0000e96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 18944 bytes
SHA-256: 38c264fb0d1979149c6fe623a7f27064fcfc34a50b7bc985a5cceba60a274289