Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ee4bf7154541c4b…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 05:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f0f8e3145565394372c40c1f3727bf74 SHA-1: 13e706ab51395e24e66f9a665ce85f2f8e4fad0d SHA-256: 1ee4bf7154541c4bb721f6afc7d5ec19c59f912d04b1e0dacb4d9bb0e2a03845
156 Risk Score

Malware Insights

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

This PDF 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 ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of multiple external links and the nature of the hosting are high-risk indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=gta+vice+city+free+download+on+mobile PDF link annotation
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/vopawemulufipiparo.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161358aee30e0a---xuwuzefusobimadarajopugi.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140e42384be8---jarugivupefu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/257b6bd7383ade81b1c8116c2f71edd8/luxelekeforizije.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/77731676973.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/283021a8b979bdcdd9ce32568d2dd3ae.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/92556656228.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/83174916172.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/nizimisiwuxudosobaxepe.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/4102873406.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/44577890314.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/5f55c6c3f24fc1a45aed07a9c7d2bd6f/75214882643.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/32607001273.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/20118238057.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/pujevatekiwir.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/15802535265.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/80715819378.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/punazekejokajevopurab.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/25557802176.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/52131732696.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614093b4f1e15---jojenikikudo.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/metowudi.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/80635315982.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_off0000d8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F3 17312 bytes
SHA-256: 8b0117e0a67c6b609e4dcb3f19a0bd49e8ed5a8f361d04f5087a659b3153fc9f
font_01_sfnt_off000105bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BC 10912 bytes
SHA-256: 6ed21ccb2c1ad06fc3f5561c038005f43a1373231379d76fa08c9301fe5c0d00
font_02_sfnt_off00011f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1