Malicious PDF — malware analysis report

Static analysis result for SHA-256 45980998969ee3a7…

MALICIOUS

PDF

96.6 KB Created: 2021-06-30 03:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9680a534206f684b67460f466f41be50 SHA-1: be1b7602271a25be9c09fc97d6a1061bbd424a3e SHA-256: 45980998969ee3a7e681e09ee94a9ca7f402eaf04e397ebbf09cc8ab5934af7d
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These sites, in turn, host other PDFs, suggesting a multi-stage distribution or phishing campaign. The presence of multiple distinct hosts and the use of form-builder plugins indicate an attempt to obscure the true malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777bb7eb992---47259600408.pdf In PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/43738b748b84dac08d09d63354e85713/52155014052.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833a08785ab---wuzewadasetebudutatire.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/0b388934dccb4d40b0cb722a57b7e6c7/lizafumovizazubironevufu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ireer9jnihud59kan83ipenft1/34397018469.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/24203654.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609aca06e3b95---gatesokeropigi.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea3e3b9c69---kabojajijupovomakuzimit.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/485334ba1a38bc2062b3f26e2008f0a3/lonevitez.pdfIn PDF document text
    • http://teplospectr.ru/images/files/21226627040.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/rekajose.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfdd669168---9878076718.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080753bbce19---35306734380.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/97668173256.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/73894904398.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/82487121076.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/muwumasaxumetiduxelala.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c35fa1d40---88408635100.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/88575648248.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/samiruxarejusoxupeg.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/e2136a491a5b2e09b0fd28c62c59b877/14594455375.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/35030509685.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/tolupirisinuvuginirugibir.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/gagokiwiropot.pdfIn PDF document text
    • https://morabia.fi/images/file/jafidaguvaperosekegel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=two+types+of+marrowPDF 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_off00011b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13358 10440 bytes
SHA-256: 52012c513be8a5e6c1c30d63433d34e16d57c46968ffe6d56a8f9b5a9517ca41
font_02_sfnt_off00014b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B35 16388 bytes
SHA-256: b08da503e54b22b2edbf20d20ddbef0eb5871cb292993f705d0933377c110f16

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