Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6c2c3df77a6a98…

MALICIOUS

PDF

93.1 KB Created: 2021-08-08 23:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e07544d57723e6129f39d8eccb7a1c0d SHA-1: d313fed2c953c6d1d9e70f9ecaa88eafbb1c1c85 SHA-256: bf6c2c3df77a6a98d53a41f078833b2afe6c12dd428c95df0307a3393087f6d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chcial.ru/uplcv?utm_term=how+to+get+free+money+in+bloxburg+without+working+2019 PDF link annotation
    • http://www.saito-ken.jp/userdata/file/zusepunuxut.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ff3988771---26991950861.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/90709851495.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2dc5028675b90cd35fdd279f6fed1509/gefosotivogezewa.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/4a58d3383cfdae61bf1ece781d5973a2/43279133988.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/31862599232.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210629203020.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/64357153321.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080109e0a1b6---2775320253.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/jipaviwesasumuwamu.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076bbb08168f---2090035587.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e3112210326---wekekubumefagapipiziki.pdfIn PDF document text
    • http://ruresept.ru/files/file/82638453749.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/nosataz.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6b221862b---64026001364.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/wugigatekutute.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c6a777825821f6c7e9d8e433fefc79d5/25307004862.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160892c9b0518d---rizubotirore.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/xuvunivaju.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d610144354---60591340134.pdfIn PDF document text
    • https://wonkingchina.com/d/files/40205472631.pdfIn PDF document text
    • http://imi.vc/upload/files/gebuvujunasunapiso.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2ad890dfe2a5b4e4f84e3361212fc553/dizumokomukolis.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_off000105ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E04 11420 bytes
SHA-256: c2aedfadcf6dcaf33ecab7938cc164f9a49d39225f00fbcea6cfd676fb4e88e3
font_02_sfnt_off000138df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DF 17192 bytes
SHA-256: 911e1b5799c2027de639088ef2b68b0e774e2d50855907a9d319cf762b69ea6b

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