Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d98b03de46885d…

MALICIOUS

PDF

88.3 KB Created: 2021-06-15 12:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8a7e07b7645136931baffdab640344b6 SHA-1: ca40ba3c5b3a525e35aef131ab82d95589ec3f6d SHA-256: a0d98b03de46885d3b7e72a50e980a18f458984c95076202b73b35eecdd90a83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a search query, reinforcing the lure. No scripts were extracted, but the extensive use of external URLs and the nature of the heuristics strongly suggest the PDF's primary function is to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nomylo.ru/uplcv?utm_term=one+direction+forever+young+mp3+download PDF link annotation
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/afb9ecc097e66ccb22c3500d5c4613fa/58700355520.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/32473919171.pdfIn PDF document text
    • http://accronline.com/userfiles/file/81330050750.pdfIn PDF document text
    • https://saam.vn/images/content/file/97909340538.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11da311590---45037044498.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160affd2759b98---39798267288.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f63c6d627---gakemiwazaliwokokojo.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079ebfaa0f85---gemidedujuka.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/f04e7741988bce887317c72b4f71d41e/93472646672.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/5873ad6e4feab5d344af04d5768b96d6/14158751279.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094e429eb47f---74140498862.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087daaecf83f---kerozibubuvoda.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file/%5C/2021050117183164.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/52189161065.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/e7a14f6afc7d916cc3e1b41b265ae428/11504396520.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606de962380b0---18012047535.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/3b9a0bd7e4efa9a32831b370a2014cf0/newagi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD057 5740 bytes
SHA-256: 38d656ff36fd6566da8016b8fc6b7b378c1e77e5bc80dc96613046b03bbdcd41
font_01_sfnt_off0000e3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E2 8920 bytes
SHA-256: 33d9a9ecc979eeb096fa01893170be62e42252e623514f5a82ea4965d9306d30
font_02_sfnt_off0000fca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA4 12244 bytes
SHA-256: 1cedf054e308733910a7e7efc93ed6fae6537c65c036340e315664652cf0f26a
font_03_sfnt_off000123ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AD 19840 bytes
SHA-256: 25317dc01fd4e229e9ff526f62b85cc83d375f3b0e2bf494fcbee3ca52d43e40
font_04_sfnt_off00014474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14474 3156 bytes
SHA-256: 7db9a55895c868f797db3943a998d03d4e76de41c68d6546dee9158f0c76e26a

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