Malicious PDF — malware analysis report

Static analysis result for SHA-256 986052dacf18d496…

MALICIOUS

PDF

82.5 KB Created: 2021-07-29 19:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a0daeba160b026c9ae939310d3fd4d10 SHA-1: 08c0a2e821026140adba38f8d769f75c28b0dcb5 SHA-256: 986052dacf18d496b60d52f1aeac1e5aad969dd518a1c6ae89286d6fe32ffe87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d6b110c9e382909b455fa3c8b94d2973/89872103196.pdf In PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f91a8248d6---43695496139.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/362c20bdd781e0fb9c8f768c04abeab3/bulobuvopalinanezuxu.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160904ec5063d1---49002080572.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/0088fe8ad9f812b14ca19339c04796ca/6921499219.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/jibosonolotafivuja.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcaad713bf---30104433957.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/verefojogexibuwoli.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/338860bdd91d3a4c4b989ef4f0db004f/80726688733.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/e83bdbb28bf37baa8a022fe1c6f7b187/golozogod.pdfIn PDF document text
    • https://menu2uplus.com/images/file/91196342675.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/25468864505.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/kevawinawanotipopufukoso.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58cf9a9a65---fabubumafoxumefabo.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/tulitukiposofanelufejuj.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/49796009015.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/78600206339.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a578037d00e---zivebijajebum.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/23380744518.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/nexogowevivowuvisogira.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8eac70aac---95969865675.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/5700760519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=el+mundo+imaginario+de+libro+pdfPDF link annotation
    • 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_off0000da42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 18304 bytes
SHA-256: c3c22607f675d467b791e4e9ec25bca415e377fa516ac3837c62b053c4d18e38
font_02_sfnt_off000121a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A7 10796 bytes
SHA-256: d00e2f435102623f2f7b7ee2697d28abf8f3c2664c949109b1f948efa396cd10

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