Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5ff9908a61af80…

MALICIOUS

PDF

80.3 KB Created: 2021-09-15 23:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eccafecb96953e4f3ac50f21fb4c3a8a SHA-1: 7c0a31f9e703cbc6dde98554094ca7e32554d2f3 SHA-256: 8d5ff9908a61af80c882ade758c704e00dfd9913d422885a1535a85310dd41b9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huntic.ru/uplcv?utm_term=class+7+chapter+15+maths PDF link annotation
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c412d8a65---27887507830.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/16895022232.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/kivivemul.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/ninozusoguvozijepexes.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/nipodopaviwed.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/2158412420.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/tixulolave.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a18ab04e0---pelomokimaxukatojimirof.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161318660abd0d---39745004207.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136a4e79380b---sowekabokamonamiditupa.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/vazufasovugupabi.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/968d9a8ead582b4a052bfb134c9adce7/sulimixozeku.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365c9143ccf---10066018874.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161413a5996920---9590858794.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/bexixesuletexanejivuxi.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc26cd1892---52702038412.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/39401029223.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/figeki.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/midoxob.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/42241422748.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/26151695346.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/wudefawogibenufivuvu.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/jetaxawivafovibijafi.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/h7e8rmek29b6d46ks1qfff2p05/64696534812.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_off0000d5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 17612 bytes
SHA-256: 0950a73b6e3feff41f4241657084840a4e8c3dd51183f15c2a1f5f30b5b9a5e9
font_02_sfnt_off00011b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B68 10592 bytes
SHA-256: 480f27c22b900691c0f6914d5b8a63d693abfb427a9c559843f5df69caa7295f

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