Malicious PDF — malware analysis report

Static analysis result for SHA-256 abbd95f90c1fb9ab…

MALICIOUS

PDF

92.8 KB Created: 2021-06-09 07:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e86e6ba5841dd1a44d3d7c9ed78d8717 SHA-1: ca606fb92e90b5413c418529770466ba0de24590 SHA-256: abbd95f90c1fb9ab7b91ff7cbea7677b9165cfedd9de72bb78916258dbf4a832
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to distribute malware or phishing content. The document body, though heavily obfuscated, contains references to 'game download' and 'wkhtmltopdf', indicating a lure for users to download potentially malicious files. No scripts were extracted, but the presence of multiple external links and the overall detection profile strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://laborke.ru/uplcv?utm_term=eerskraft+game+download PDF link annotation
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/22736947064.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e2f1aaf9a9e04447f0e201801ef212ad/ganag.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160741c77e788d---5212870520.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1677c3dce5---jetasuliwiwukakinufof.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160753abfec762---50382556834.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/7vpv0n0or6kkma1mc0oeja39ma/mexabononugebamuzivod.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/c0fddde9be9044a62ef3f0ec2b1cd9bf/wimematuzol.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a66f293d---76744687306.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/67307993378.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084df764d2a8---gejizo.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/67759371890.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/wasetobojejugawigewatupil.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210501060517534393097.pdfIn PDF document text
    • https://soechi.net/userfiles/file/14275275578.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/49436882399.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee55d5c86f---55151619795.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fc8fbee5e---72210231558.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012753.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12753 27324 bytes
SHA-256: babe0e80fed0ba167ef698fa08e03a60eab77f73941b45696f52042f20304e87
font_00_sfnt_off0000ddc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC6 5080 bytes
SHA-256: 6b7b560d5ee386301389a98c5525af801f98e628e26524defcb7a266d3be3a46
font_01_sfnt_off0000ef01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 5124 bytes
SHA-256: b65c0f406b3f61639301a05b4ac096970c4e139c145a42e9d0eecf4905c2e816
font_02_sfnt_off00010142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10142 11080 bytes
SHA-256: eccc1c2e79a0a78a0d6bac4fc333723d0f977f55a9c11d8c6aef580442f300ab
font_04_sfnt_off00015731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15731 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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