Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ef9b6074c140ad…

MALICIOUS

PDF

75.9 KB Created: 2021-09-02 15:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b9f88d1ead8674a62ae2caf45aabb24f SHA-1: a92ed4a3778085a689963f72b8b2f0a45b78c55b SHA-256: 65ef9b6074c140ad0f156a3782615b8d660d95cba41c41e76c2602fcecb2402c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the heuristics and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://huntic.ru/uplcv?utm_term=global+history+urbanization+worksheet+answers PDF link annotation
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16078bf587d129---55470307843.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/pukuv.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/nijixozijuzalelif.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/fazufitubizorog.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a96f952b3e3---4300517428.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/180b529923784f49bdc577f7a2a935b8/ponulonabed.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae051b9e33e---tixigenujokajusomekinak.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161007eee7aadd---nimabofedelaratek.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a1skkfbcj686u39pl40rkk6l2/giruxapexifemekezoroti.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/15267934709.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/nejafivokijigodawoxur.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608210b85ea43---jikarowimudavup.pdfIn PDF document text
    • https://signika.pl/Upload/file/34557179498.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/lomodepixiwevijusoj.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/3285fcdf0bd0a441a212e233ce591628/rikarilevaguxapebazogixe.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/21377813460.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/4auinsd4fdhpdkn4rn0k6fssrt/45602346460.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/42944175811.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/xabowidesaputerak.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/lizivezuva.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16093cb1575d13---14378476605.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_off0000c507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1E 10836 bytes
SHA-256: a1420eff04eb2b4d6773abf676588799c4df24e16da43a949884dc33b52c0314
font_02_sfnt_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 16864 bytes
SHA-256: a268af8ba1750feda82de455826986ba264d07f506093127474c3cb275f871dc

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