Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d6153735181b2e…

MALICIOUS

PDF

98.8 KB Created: 2021-06-27 10:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4406754cc6c9d5fc28153a140e154e60 SHA-1: b6e51fe46ad61543c5a47f85163760bb38e57634 SHA-256: 96d6153735181b2e9d1a27be76f1af0a67c303c528567a59bc9ca7622b7bc786
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external resources, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/caefd734c203e8b8a19470d051bd23f0/xireranawanuj.pdf In PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b4ad9b2ac---xakutuso.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b155af6cf4e---megevazujoko.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608151ac599c1---87348201349.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fc66d1086---benusugibilufajujo.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/wopuzasajidijixav.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/dajafoteromeveragefunot.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/9f298b3a972c0d30fb8fc10104478b80/425500457.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/0463bfb13e2d2df4d0a58bfcf09c847c/ragenememugiz.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/64513726247.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/fi3e7r846fa88r940r75v2qg22/50105206306.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16091042f19860---sazukuzimotunawu.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/zuzibofaw.pdfIn PDF document text
    • https://isleo.com/i_photos/file/59771221191.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/da674eae20810a7d8ac82e3f695d801a/96176546077.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a50253fc7b---65825893340.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717ad0677c7---ginarupokinakis.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/heqsp5ju37o4ee5ocj87koe7ne/1096650801.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/d0sqvqlp5codb8gjmfkrpelta9/basobo.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/duwonu.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c28f265ee7ee5aa1f2b5423a61b8d55b/510801313.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/bnjb64rn6cm0ge6ji3lcheces9/fitutekefagirimebowej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=spoon+shaped+constellationPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001090d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 2312 bytes
SHA-256: 225c0d757e4d0d6a808411299ed8213ebee368952897e2dce3f33ccc37f89196
font_01_sfnt_off00011332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11332 10584 bytes
SHA-256: c365b9a53ddb92017c5d9c10dba02175346b58bcafcb1e7db252efa568171a2a
font_02_sfnt_off00012b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3F 25268 bytes
SHA-256: 843d166dfd95e8212ab88028202fd4f7a0b1d4f5770ab1c750147f89df116017
font_03_sfnt_off00016569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16569 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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