Malicious PDF — malware analysis report

Static analysis result for SHA-256 492f52a1fb604da8…

MALICIOUS

PDF

86.7 KB Created: 2021-09-20 15:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 457c02d773d7b689a7c08faf81db3659 SHA-1: c9a881123732a3d207636c1c757909273196eb8c SHA-256: 492f52a1fb604da8970b8072159bcaf4aeb080c31e6caca9282474a3e851f3f4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the 'link farm' heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=watch+series+online+free+full+episodes+without+downloading PDF link annotation
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/cg96tig5n15qa5msegmvc1evh2/lababadazava.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/3861195319.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/maderumepe.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/69118959897.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413793f0597---nuletifipifedifuvijes.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161365528926f3---54082195198.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/67584160553.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/40736683586.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/17317191055.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/72598842846.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/xigobube.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463a746b0ba---19608135810.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/81603660362.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/26191450610.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/s9aibtvabcmmugco4hmg6so90v/30579730760.pdfIn PDF document text
    • https://costarica4d.com/contents/files/zaritokukabuxelesojef.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/gejuvanako.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/kiduwesomavi.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f26081c47f---wolifalopetemexul.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/60856273968.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/23831945649.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/busavudijetobinerizuko.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_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 17436 bytes
SHA-256: 930bafea2a065753e013f759821c9a74013de9773d7293e3a5246e150f1edb11
font_02_sfnt_off00013309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13309 11080 bytes
SHA-256: 7659ea7508320cd1577d53613664b5434b297fcd983854776bbfbd46674a367e

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