Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8ede9ffcd2d335…

MALICIOUS

PDF

79.1 KB Created: 2021-09-01 08:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f40021326f481e88b9fa134513d759b2 SHA-1: 613e685db60f291a66950f87d69e41592a8458b6 SHA-256: 0b8ede9ffcd2d335c50bc742d1312878d97bb51e18623de456944111a49b8e94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the URLs and the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://krisoc.ru/uplcv?utm_term=quintal+into+kg PDF link annotation
    • http://alphasigmaoverseas.com/userfiles/file/wegurodoge.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/15721631039.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/mukuvulimekukofesapudaze.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/14249408063.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/88167761438.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/bokogevurapixafalibivevo.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/67591054689.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863a4210ac5---simasagexerizunefe.pdfIn PDF document text
    • http://abpaluso.com/upload/file/jijifinuzisexiponere.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/95565872924.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/89034983339.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/7k8d5nhok359a73p9i7o425p0j/nosuxiburadorumemit.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/lujuwere.pdfIn PDF document text
    • https://melz-feu.ru/upload/25790284261.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb11c4edab---76517943766.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f45bc74a4---14623248817.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/dnnojsohifb9i6ehg2j9uiq522/72978935971.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/949ce270f183d4afe8465308e70a5788/gafixowovoxudano.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/9mffjgvm6ajq1io6l7e87m90n4/18711999579.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/45782448795.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/wibonowajokuvasuseribidon.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1135271c6d---tinemajuxokufejuwok.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/wabired.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_off0000d0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F1 10136 bytes
SHA-256: dcfc2d704bb3b6a54c050a1d95c1a436053e2ef0773a95a99a741add00a2e092
font_01_sfnt_off0000e7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 17936 bytes
SHA-256: f4a5c9b0d551c94363fc75bf3c593b49c4be1cfbf07cf95d57ae63a7cb199f83
font_02_sfnt_off000116aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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