Malicious PDF — malware analysis report

Static analysis result for SHA-256 830cb472b8da8357…

MALICIOUS

PDF

73.1 KB Created: 2021-09-10 08:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 45c192bcf97ac99af26386574ef80df1 SHA-1: 82631592250007e001e87579b46897f5ad5adae3 SHA-256: 830cb472b8da8357903263135ab6a0103175cfd0b4e37982a4f0ac162c3900b1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to download potentially harmful content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=amazfit+watch+apk+download PDF link annotation
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137b49eb8c15---dunusodosabinetinurufalir.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/30975993281.pdfIn PDF document text
    • http://domexpo.ru/up/file/kagesadozegokudesisitil.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/sunidunena.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/42885830149.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/xiniluxiviwuwepo.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109050105206111.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/10832536892.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134fccfdc9db---xojilukunisa.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/29766829488.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/67689676065.pdfIn PDF document text
    • http://favorit.pl/userfiles/file/dudiburemutunetaxobi.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///ribepawovonawaxasuk.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/rarezubobawolomuwilan.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/20213781163.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/77856185252.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210901_164705.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/22977056359.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/52393989256.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/zelovajivisenodu.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/jesadu.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/45006395795.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/87465894552.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/96a79b09b203aa791ecfa3499c3995ec/nojoxonuvu.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_off0000bb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB87 10704 bytes
SHA-256: 28bcaf18f8bdd98d61212435a937a1702ac20ef174bd0fdbc9834424ea246662
font_01_sfnt_off0000d3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FF 16848 bytes
SHA-256: a99bfece1aedefe03686864ed0e0769cf5140529d27196a2b4c9c8e963fa2d17
font_02_sfnt_off0000fe8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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