Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7e5f17d076daa2…

MALICIOUS

PDF

86.6 KB Created: 2021-09-01 05:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1c5cf3499981654ff8e693d1ca2a2c02 SHA-1: 414f5ec48e1daf35ea85cdb87470135bd13e45d6 SHA-256: 8b7e5f17d076daa2c5bfb011fa05d847b69cccce3f11f5c69784a008dc524d2e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress upload storage, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into visiting malicious sites or downloading further malware. No scripts were extracted, but the structure and URL patterns are consistent with a link farm used for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab43ab48235---42518645408.pdf In PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a20747c6594---tevujimagukazolorum.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/eaed023c04a502666a3fe39d81745927/karewixisir.pdfIn PDF document text
    • http://logicamail.it/draft/media/vagab.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb7ba00ea9---92358730365.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/bijolajurudu.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093cb37264ec---89468675935.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/mvbted44atu223e2c9ffabck33/pudakuwidumexuk.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/ranez.pdfIn PDF document text
    • http://miltonhigh65.com/clients/874455/File/xuvilexup.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/gofikafotaledaf.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/lajivakimog.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/majasilonij.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/38842043802.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/20643035863.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b450dc5d929---30631109376.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d213f8d0683---95260981963.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5aa339fd4---85165138024.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d4aec713b7---81311734641.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/biifr3mig3d5o23qt8l23qcc3p/dowewef.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bbce3404f---8467377390.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e263a156---jijaneranu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=eclectic+therapy+pdfPDF 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_off0000efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 17176 bytes
SHA-256: 96c38e788ce4fbe48417e548d5cd2fc7c5e42a63a704bd90b17a5b175ca6183f
font_01_sfnt_off00011c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C47 10420 bytes
SHA-256: a8e0c777625761fadfaf917fdb963b9e341990f7c5c8ddc5604d0d00c32df548
font_02_sfnt_off00013402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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