Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4cea0af56631a7…

MALICIOUS

PDF

99.8 KB Created: 2021-07-02 20:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e25a279e40e7c1872c571f785b088c37 SHA-1: bef42686f4fdce0a22ea025ab28b31bcdfd1e936 SHA-256: 8b4cea0af56631a785b35f15a15f648431d6d9720bf70d3b297a31296861b19d
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a97b65e130---nusilasakunumuk.pdf In PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/96829304637.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/setofebitivekoworex.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a724d02a0---5762459458.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/ac9edef81c15d37227669dcf61453641/12998855525.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/186v8jfmodmdsvl49nrr5viki0/korufivasivukuwinilo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ghje50rtvt9mtu9ivkdu3sl164/23369708894.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/oaqtnnv4lkpviucfkt4hba8r96/57014900912.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/purexarazuxijanas.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/koradugujoxumudev.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/bagamipizamifatunozijiv.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad1ef473c0---falalafowivibixowolitili.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/kagodibirixejirubuwefis.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0daad6ad8---kopolik.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/86337634.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/sazipitum.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d86ee463ad3b1a0902fe35c87b897dfd/ruzovu.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e11c9bca1f724265304253851ac0354b/kovuvolog.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/b77niphg668bp8mvqttaef7795/sofavarabibisak.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1458bbc15---52788711085.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bf3b512a6---96372127809.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/vavaruzaramurenolaf.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/vanososesupukav.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/14229526700.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210625_EADB5478FB503525.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cabedee298b---962107977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=inappropriate+newlywed+game+questionsPDF 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_off000121d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D1 17828 bytes
SHA-256: 487fa2c772ccf0c46c29c6a88c9b5ca8cd54893f32a0532a8f93989faa46193b
font_01_sfnt_off0001502d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1502D 11132 bytes
SHA-256: 3dcde97ed4ebccbd42039793117e392a1e68daf476481bb910af6e037582462b
font_02_sfnt_off000169b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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