Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc25d20f72a49902…

MALICIOUS

PDF

84.2 KB Created: 2021-08-05 08:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 59c5016bbbf3719acd150627eae9c86e SHA-1: 46e3be4cdc1366cecb2e9b538e823022cd20a30c SHA-256: dc25d20f72a49902f840ab45473838248a9eeaefb5de25692ec4ce768fcff948
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 an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an intent to redirect users to phishing sites or download further malware. The presence of multiple external URIs and a link farm structure strongly indicates a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://nomylo.ru/uplcv?utm_term=sadlier+vocabulary+workshop+level+f+unit+6+completing+the+sentence+answers PDF link annotation
    • http://ambvetfanini.eu/userfiles/files/28399397551.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/4e071317c4d13dfaa3d8b34e78ba5ec4/31003234681.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/52077169214.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/mabudolinuvosopupidija.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fba0e6d8408d9f9fe6a94da44503a8ec/96121135891.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/285157172e5a4e16a19653167fb93b91/sisetaxazupesebim.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/tetujo.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/luwurovomuxepiwu.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609012831b00e---demaxanepesivuje.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/bilovawapefikipozozaji.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a774305329c---79821399571.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/3f521848916f1a536e68a03802ea46ad/55705371612.pdfIn PDF document text
    • http://salinasouth.com/clients/11073/File/41244467344.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bff111300f1---2881067421.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/70376468476.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1965da456a---12954465740.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960d20a682c---34397847452.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/51460186412.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161096c4499cf5---faxukevoritoxe.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad14d196cde---56646552230.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/0coru9aqq9ke3op6cqj2oa85q7/11317099348.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/sipugipetipukezesuk.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/t508lcu9bkklu8lggga30gi1e4/22493746840.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/22929589965.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_off0000e908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001011a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011A 14472 bytes
SHA-256: f05effbf43def7486b502773c7df76efce8e959a8c849d9fdc5e19be2d353c51
font_02_sfnt_off00012589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12589 11908 bytes
SHA-256: 29669e586b8d2af6038a07ab9c3b1b4b3b9ccc70f11883142259f482f80e12c2

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