Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52be4ce9e7284f6…

MALICIOUS

PDF

88.6 KB Created: 2021-08-17 16:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f339213790be37e19f6d4fae7ef0c129 SHA-1: 1dd23917bc5d8d5ab0147a01d46b3638754da409 SHA-256: e52be4ce9e7284f6e4d6ac7f7f33c7ca7b8601a70e6690bce4236387a228bc92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The embedded URLs, such as 'https://synerhu.ru/uplcv?utm_term=how+to+install+netflix+on+nordictrack+s22i', are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://synerhu.ru/uplcv?utm_term=how+to+install+netflix+on+nordictrack+s22i PDF link annotation
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d63af381441---37260323286.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/b27346c60bc9520b788204684c13b4bd/guvonejedujabadipos.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a30b19bfea5---rigosagifaxexajoketubixi.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075e8ccc639f---28749848636.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/d4606bd3d6b61604382004a205970885/48011117743.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/49470932315.pdfIn PDF document text
    • https://zzhqhi.com/d/files/1045759113.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ddc7277314f82d4ddc496f047946257d/69363526847.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1239cdee98---zonopuwug.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/0glc4184qujed7inujvoupmqfr/vuken.pdfIn PDF document text
    • http://kotolantopeni.cz/file/newonaw.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/rilununijigenamera.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03481c0476---dituvotifurogujagezewe.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210715_160635.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/ziwovusozopejebixasude.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/08c81ea94cfdab67c7fd390e8fd04cb0/xurosarak.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/vb3m2se2vkfhlerp1hql7uet25/kosara.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/wuxaketexorademamu.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a824abe65---84162704163.pdfIn PDF document text
    • http://metallpress.ru/files/raletewiduwixati.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160871ab608d34---bifapa.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/sutim.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/pemiduzaziwowenudijig.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/kiqphk6b6r1aob02h0uqdpnuni/55900971175.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202107/1627167004.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/metesazezotasub.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/16897211300.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_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 10860 bytes
SHA-256: 0b236469d953fc899bf3fa53c2cddad7ca18d7b39605d5f7595522af7262223e
font_01_sfnt_off00010dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC7 17220 bytes
SHA-256: 28e36bc076ac046aa19059d5731a85f1ed35b0320a24c1461179551d2b7df551
font_02_sfnt_off00013ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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