Malicious PDF — malware analysis report

Static analysis result for SHA-256 092f16dbf2bbee68…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 05:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a5dcc5bdbcb2fa0bf7586f7b0b76949d SHA-1: 0898052ee44bad9c72eb8f843d008bb3e475fabe SHA-256: 092f16dbf2bbee689e1066c44e036c31907e3f17a81264a6b002705d2179357a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs were found, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or link farm attack. The PDF structure itself is indicative of a link farm, designed to redirect users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=hack+last+day+on+earth+2020 PDF link annotation
    • https://lomasdelaweb.com/userfiles/2008.09/file/69051860658.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142bbebc433e---32324630742.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/pitanililik.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f83c29cded---vanubox.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/53806921538.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/moxilu.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/10819484874.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/lifudov.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f6285a893---90036724140.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/rabasedivato.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/49098053371.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/0r43cjmhfhpf9qaei0iqbhgvl7/zilow.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/lonubenupisobe.pdfIn PDF document text
    • http://trubaopt.ru/content/file/92991702694.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/jenoraluz.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/do7lkbgk1c7uno5ec5t5tda3u6/ruwoxovoxizufugadad.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/fokavadifanemafebiwobuw.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/63214012941.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/mimigetupazi.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/67958069640.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/53747728282.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/24771377613.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/fanikagi.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_off0000b118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB118 16592 bytes
SHA-256: a962ba0828e9ebe682706dcfd359433aa3dc8519ed7f6e0aef249ee86dff099e
font_01_sfnt_off0000dbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 10816 bytes
SHA-256: 950e350661b282ae8173f195cd0e931016ca449c1d50a31da9ce140ac9f277ee

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