Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b9b105f30761fc…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 22:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45e58cc4764bea1c49f91e473378c905 SHA-1: 9a08427c9e95bfcb8e6a3cbcfbe90fd6e95efaf7 SHA-256: 75b9b105f30761fce2d4892a9f7dcdf518631a3269390f1084b10a1b599d75a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of embedded URLs suggests an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=id+card+maker+mod+apk PDF link annotation
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/39586153660.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613506c7eed14---55814729061.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138fafe14e11---75348285714.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/79797113045.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/ruxoxomagegivabigiw.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/fafaxugokubesutil.pdfIn PDF document text
    • http://zima.italie-ubytovani.cz/data/file/fenabowu.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/17079725753.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/vawanevawafo.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/wawapo.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/rojebatomodakojobalupona.pdfIn PDF document text
    • http://tradotel-riviera.com/file/togixedobupam.pdfIn PDF document text
    • https://haidangpc.com/contents/files/makoxur.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/30931132445.pdfIn PDF document text
    • https://subarini.ro/mm/file/71041552798.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ca69b4be537c544bb35ad9534cfcf710/rofedojamusaw.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/sazodizoranukejiludubipab.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/88669717814.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ae232849c56c9b9202fc8b7921b63fe3/dikupulesedewedek.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210903_7824f.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161319d9fcc589---71312408170.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/90199135796.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/kulufasogafevapusutadipix.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/39282723679.pdfIn PDF document text
    • 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_off0000d442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD442 17452 bytes
SHA-256: 4070bd3d133cdeca12864f1cd8a4b58fbd2f97fe23a0ba83a7567b4a5381cd37
font_01_sfnt_off00010122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10122 10212 bytes
SHA-256: a9da7077f83cd5bacda27ec7a39a05c38b571dafd4e762c45f19a63bb0c817d6
font_02_sfnt_off00011802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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