Malicious PDF — malware analysis report

Static analysis result for SHA-256 31460e34bc0b0347…

MALICIOUS

PDF

78.6 KB Created: 2021-08-29 14:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fbb629ebfc648b9836fd7559edee5a77 SHA-1: da7722c62a6d7514ecf929d82a7ad40b85859bd8 SHA-256: 31460e34bc0b034716d29c1cf993b9b968b8a6656be35abad02acc23cdd34b68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the structure suggest an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

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 http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/tevub.pdf In PDF document text
    • http://pitchdecor-construction.com/user_img/files/66733579760.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/c2c030bda3ed55a7ac705be05a7210be/gekuwuvimuwakopujedilale.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d0075b4a1---fozup.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3860abdc94ef7926b1ad18baed22cfd3/zajisikewebezifemediganu.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/welosukexale.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/31nnnv0hgmbrdkr0gu136aaqfq/kiruzimaxilijefobopixix.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/bukufutudomajepozizenaxa.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/70868338952.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd184b7977d---vajuvolesutuwefadenugiva.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/pifazatudekiturenokujifot.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38731331135.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/wipiwixevatedane.pdfIn PDF document text
    • http://whatdwellswithin.com/file/82519606405.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2bbd22abf---padasuzojofebovebij.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/32322834785.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd68aba9e9e---44257017026.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/nanovasugidobe.pdfIn PDF document text
    • http://alhs1973.com/clients/64426/File/pumezopefalijepew.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd06ef72845---28656046268.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/af05806d0496ba13214d9da1d7939a90/salizokisun.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083abe837556---wolofobipigatudodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+unblock+numbers+on+iphonesPDF 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_off0000ce00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE00 10884 bytes
SHA-256: e40e49834bac08616a646ed2d62a2b1b585d68bbdec8842b42eda86bd8a62be7
font_01_sfnt_off0000e6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C4 18016 bytes
SHA-256: de68d8e3df63ded7f1f254804d7e8d1182f0bbcbb2623587b7feeac09505c6ae
font_02_sfnt_off000114ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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