Malicious PDF — malware analysis report

Static analysis result for SHA-256 e978e9714b3b49ba…

MALICIOUS

PDF

85.3 KB Created: 2021-08-18 07:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 74733f24f001c6d8376f31b25dbf1874 SHA-1: bdc5b10d4ea0a961a0d843084759db854c6a6021 SHA-256: e978e9714b3b49baffa453f69d8cc10fae2f0264324abf43c1429c572ef96019
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://novamakine.com/upload/ckfinder/files/totelasoxuduxozejudilus.pdf In PDF document text
    • http://kag.fr/userfiles/file/dimox.pdfIn PDF document text
    • https://tdsns.ru/userfiles/file/rigutison.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/mutuwobikosamopa.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/909ae5e9eeda02f1f9a87f08c6e627ba/41915030984.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/soxenejudisila.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080ba7746822---kurodufufovenugoxe.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/ripuwilorunijozutibagiwa.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/67039137120.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/16354097945.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/45505900245.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/falemesufapuraduxudom.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/bakewadejuki.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/40866756519.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/fokavokoralowozanun.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/25e9e03hgbffdoc39ct8etc55t/57939279348.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/wuwegojadasaxoxarem.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/godokipeliruzofadi.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/k7jbji4vqj23ovum988nccvqhl/48386497347.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/hpq2u9vqmddv7l923vg4ogp6n8/mimowamixuz.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/pazadejiwixu.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/8881194984.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/24810405187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+prime+a+cascade+canister+filterPDF link annotation
    • 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_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 10860 bytes
SHA-256: cffcc5999a2269554e895ade6ac9825853739efb7c8536152918e8f4bbd83b15
font_01_sfnt_off000100f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F5 16876 bytes
SHA-256: e7e6dee11621ecb063769f195e8b7278c0944ff63f5e95b148dbd05f8ae83614
font_02_sfnt_off00012c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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