Malicious PDF — malware analysis report

Static analysis result for SHA-256 461eaca1f54da966…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 15:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7ef8f8a67947fba16df3051a782a0c0e SHA-1: 2cccf70b179cadd0000309b9cace8db2f02e7a61 SHA-256: 461eaca1f54da96695fe56a00b3ef22acc3dd54a4d00fab040a5f237a52de56e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into phishing scams or malware downloads. The presence of many distinct hosts and the use of UTM parameters suggest a coordinated effort to leverage SEO or spam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crysiq.ru/uplcv?utm_term=properties+of+cosmic+rays+pdf PDF link annotation
    • http://amidoux-peintures.com/ckfinder/userfiles/files/sefiwojefa.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f69acd73b---86046221362.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/add34b63add9affcc8ef9844d61e7b9a/fozofujolokizakivuweb.pdfIn PDF document text
    • https://regenerateacademy.com/file/12110450427.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de4eae59a61---toxid.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/51965352930.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/48730008270.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/56901316948.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609173875bbf9---fetutiwekoxibazo.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/30429258867.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/36100346631.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607964dbc5864---31445120867.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/73e2ef70e857b497d39220e53fc42508/nakoluxijuk.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210830090703.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/bezukokujamimok.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/xuvodomejami.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/xefofajosome.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/15886361794.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/16056819327.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/36151569641.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/80092057517.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/rondcc2ckhstq0ahedktcuolp5/zaripukarodogala.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/556951527.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/80436851542.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/2f67b3ddec669cdd2375b67e525d42ff/8786096451.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c39e185a---pavuluv.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_off0000de3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3C 10748 bytes
SHA-256: 1135bd1d5bc1f38fda3b34d97fcba5223815c858cd4463466306c788b67b4b53
font_01_sfnt_off0000f70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1E 18088 bytes
SHA-256: cb0268bc3010300673bd2587f23f64e70d54eabf00df740f66a44dcfed7600a4

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