Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fe8ab175441930b…

MALICIOUS

PDF

74.3 KB Created: 2021-09-07 13:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 44860418be1f67149f069e3b48dba4cc SHA-1: 707aa8b979b8097a43970750de212531c387c685 SHA-256: 0fe8ab175441930b58f37931ce16865148cce325ddad22ce9b34c0b69ec4896d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the execution of a second-stage payload via the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=sample+shipping+documents+pdf PDF link annotation
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/sosuxelimegazodinopux.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/95158923724.pdfIn PDF document text
    • http://hidropro.hu/upload/leduxip.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109060734053530.pdfIn PDF document text
    • http://poiskvod.ru/images/file/feluwusufunum.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/vakezazumaxoxe.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ac814f8e3---92353568440.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/naxowe.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/dbb3be5c7ffbda81da24dc5dd750db7b/lurulepewevumepidu.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/41332413538.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608185a058022---74075489385.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16088920a29651---sofawajibud.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8bf0268abb65a503a03873f00957d70d/xebezalonoxefurevofidef.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/76065767292.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/lilafikizuf.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/13966887046.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/jawugepekuna.pdfIn PDF document text
    • http://dsraxys.com/uploads/33414325193.pdfIn PDF document text
    • https://togeltop.net/contents//files/supisomosu.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/pesuje.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/16e4e7871784daac4dce06bcad4a21af/1824079429.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9649d4b2cc---rapotudasavewodidomozuma.pdfIn PDF document text
    • https://clinicscrm.com/img/files/walozimuganoturo.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/nizefokifowekefaluwukedem.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_off0000c05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05F 16448 bytes
SHA-256: e37f542ca41f198c356c307b5fa1e21e490747b12a5f32e03298915f59947d45
font_01_sfnt_off0000e9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10203 11140 bytes
SHA-256: 08f11b37b107e3884ac8c23ca6b380f5b77265fc194446daa2dd7f1704a96117

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