Malicious PDF — malware analysis report

Static analysis result for SHA-256 a082d1ce88828611…

MALICIOUS

PDF

96.7 KB Created: 2021-09-05 04:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 72e8fa8b7cf0178553326c89a4c258e3 SHA-1: 8937b7562586c9cfd24b8ae61e4652277bf0b3b8 SHA-256: a082d1ce88828611275854aa7ddcd8f142b7b38848b6b5030ddbdec6721f5cbb
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites or disposable domains. The presence of these links suggests an attempt to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=aorus+x370+gaming+5+manual PDF link annotation
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/luzabegisimudonob.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/44220179192.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/b3141acec87dc7a2980bf1c90ccbe069/rukumofegenebaxomu.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88c6ac7770---guxal.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0cc0df5cdc3696c58acf1bd07ed3741/40208229562.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/lamoxezobevob.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/debimerimenuzetuk.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/dorifavugavutiz.pdfIn PDF document text
    • https://kildevangen.dk/files/2511808695.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/91fd5acf5bbcfaff90a5761f72402522/xuledosewogobereselov.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/mofifapinoxawotikerodatu.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/vemobasove.pdfIn PDF document text
    • http://3sdent.com/upload/files/51631410026.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af72606b827---davipijorigixeniruxu.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/zowezosanojibawabimege.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/120214366043.pdfIn PDF document text
    • https://agros.net/uploads/file/69513575089.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/24670643127.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a310b7c5118---71420529670.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/47794253746.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160beec64d7489---nukebimat.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/4655175712.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/31662532277.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_off00011574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11574 17900 bytes
SHA-256: c2bf435cf796fc00cbe94a31aad46cd67b31b432421f0566d0f64f0082431ac5
font_01_sfnt_off00014473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14473 10884 bytes
SHA-256: a736f8817fa84ddf9f9d558bdda9ca661b83f6efc029c5bdeaa8ecfb7fc02b74
font_02_sfnt_off00015db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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