Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf4973a9dc714c5…

MALICIOUS

PDF

71.2 KB Created: 2021-09-30 22:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d1ef1734172cc88591136b522f8af29c SHA-1: 5491d4000005425683ae8e46557a20ed1c425ad4 SHA-256: 9cf4973a9dc714c57b1b49ec06af70101633363519f61752eccc8a42e3432102
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to phish or redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the primary evidence comes from the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://daoltrading.com/userData/board/file/poxumem.pdf In PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/xeniwojisazede.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/zolupugo.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/kusuborawirevaradovaram.pdfIn PDF document text
    • https://cityface.cz/res/file/tipijasukikajise.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161454b028c065---reludinafo.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/23820095970.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/12383710748.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/5820380108.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614db4047b039---89186964796.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/1624682130.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/lovifikigegosedamep.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/rowipudofilan.pdfIn PDF document text
    • https://premium-house.uz/images/file/83918471880.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/lulosejetifebarupuzigoja.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/84803977632.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/24454091400.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/kobirojimimuzukuk.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/22904673224.pdfIn PDF document text
    • http://groupkaishan.com/d/files/12344959175.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613845de6bf3e---63890284613.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151aca1337b0---80510097623.pdfIn PDF document text
    • http://recrute.fr/files/files/mivibodareramemijovamete.pdfIn PDF document text
    • http://maulich.vn/attachment/files/gidipofedomekonikesof.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143a95665985---kufexato.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/43203074391.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ro99gcunsicekdbmhre40n9bip/gemidaveworulasubimerovez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+wifi+stuck+on+obtaining+ip+addressPDF 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_off0000b40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC21 11148 bytes
SHA-256: c2370759e98c68dfe122655e8fc7298f17c96d9b7f074db53ccbca91d9e36566
font_02_sfnt_off0000e60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 16160 bytes
SHA-256: 397930073f8b8d5a7127b64fd15f498791360c60656a5109554839b0f10be676

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