Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc18fa0a91a339b1…

MALICIOUS

PDF

87.7 KB Created: 2021-06-25 16:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b91c6d65faf6ee93d71b33a6a1ddff57 SHA-1: 90378a01d03f87272465bf083e9f5f3d214acb35 SHA-256: bc18fa0a91a339b1f7f6fd267cc54b07ebad546ed8096552ad8a01fed1d45c21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised websites, likely serving as a link farm for phishing or malware distribution. Heuristics indicate it's a link farm on disposable hosting and potentially a compromised CMS upload. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=check+website+for+broken+links+and+images PDF link annotation
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b01053e4f18---dumoguwovesa.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945737063c7---71921785800.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/k3ds16bpvah9jbbdt4l2nqi9ms/18619553971.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985635e6cdf---43331719423.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f64f34f64---jadipuzodunukexakoge.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e00b88fb2---49015191136.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160920199de21f---zovusofebefujove.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/gemixutinezevatokoreviv.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/7dacfb7dc4206cc93e47bc2271cd858e/dudotalezuwitolo.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16070b1a057560---jelowizanelis.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/kagegoz.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70844251472.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0069ed3e8---41795633407.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/bojusorojosadedufisopo.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c85d313e6---60968910943.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608be4097ae75---zibofekexizijosawigufasa.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/87751222326.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/86907227693.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e7e0e8ca6---xaten.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_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 11272 bytes
SHA-256: 09bb04b2e6c80d83c4f5d2cd3daa388fbc01fbed020a34c71878ac6994aeb229
font_01_sfnt_off00010b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B29 17648 bytes
SHA-256: f73c69a9e7e14a2297612cfd92f2b5254f882fcca9dc5f5d5e42c89edeaa7a0f
font_02_sfnt_off00013999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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