Malicious PDF — malware analysis report

Static analysis result for SHA-256 990adb2f3d4a0d69…

MALICIOUS

PDF

90.0 KB Created: 2021-08-01 17:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 162ef62be38c368b2613a70dc0083d90 SHA-1: 1bde5e2d17caedcb5b6228167616aa476b98b4a2 SHA-256: 990adb2f3d4a0d69740607410fbeb43e3eebbd55c8ec6f3088b2f057e0968011
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cructi.ru/uplcv?utm_term=how+much+are+factory+to+dealer+incentives PDF link annotation
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/35298772356.pdfIn PDF document text
    • http://zimmerei-possert.at/70011924233.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c9b5b3a6a---jeravadonuzurim.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210525080239.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/i1rec38qsag1smkjogbv62ivat/12673705999.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/g087d4ng4jnl5n70db7gk6gcaj/12714075022.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/livawenoxemosojizetefux.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/07286cf5854a0231887b948da178fc37/vajuwubevobaxutu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c8a3a45903d7b5ac5a54acfd308e222a/vugasokifoduzunigugupanik.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/lasenego.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/c4e46f4c045b7ef38a3333c5350b7c9a/3998419410.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68b818adea---89228977393.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/losudutumuwuzuwip.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/regiroz.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/lovitap.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160747aeb19c9d---jiginivasuwitafo.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/52095776176.pdfIn PDF document text
    • https://actor-conseil.com/files/file/1649552979.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e6c651719---tababonarasupufej.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d21e24d11a---2553506691.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/10365036066.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a0205bb8e4f---zobuzipeziparolewiwaz.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/litutu.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/keguruzesolewufasuj.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/72174981985.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_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 11096 bytes
SHA-256: c2e54c7766e90fac8292f2f12d884bfcb63157a6b26229ef817ba163b664c83f
font_01_sfnt_off000110b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 17960 bytes
SHA-256: f55f9300ceff510e9e5acb7c2bffa5586422f175dfce7864d0e8a3e18208223f
font_02_sfnt_off00013fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1