Malicious PDF — malware analysis report

Static analysis result for SHA-256 76570595f9a6bba8…

MALICIOUS

PDF

78.4 KB Created: 2021-09-19 19:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 613e6efcc7f05b4993ec199edf15e0e6 SHA-1: 1a9a3242efbe26a243c6aeef7c07870a055d8752 SHA-256: 76570595f9a6bba8493a4a776df1adc615da40f30a989377ee9441e6466eae43
204 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the download of a second-stage payload via one of the embedded URLs. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=hero+tamil+movie+download+720p PDF link annotation
    • http://bantinnhadat.com/users/files/63828715495.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/87378002446.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/vebadedeberozi.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/bibevenubinilizofirepe.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/57654073797.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/0c4dbebccabdce112cb871b3c9c009d4/31709307275.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459afe34f01---gebajibakoxuwaxiledinip.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/niromiwinesodekaja.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/vuwevijofovaxoxud.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/77751587040.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/17682956279.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/37871033372.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/jereveremu.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/75160914397.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/93761053562.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/lafuxiriboxodafovoditizu.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/bazawigitirefarojukerilex.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/sakamogeparorawozawilubuk.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/96588206030.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4dd2d0be3---21624164811.pdfIn PDF document text
    • http://baove24h.org/upload/files/sapule.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/34945421693.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/53926822124.pdfIn PDF document text
    • https://people11people.gr/uploads/File/88896144498.pdfIn PDF document text
    • https://blv.by/upload/editor/files/94998789303.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_off0000ce15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE15 10820 bytes
SHA-256: eea28669867174673c3857b07796ca0117b45735097c1547f0f22a8da8daac5f
font_01_sfnt_off0000e70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 17344 bytes
SHA-256: d1054f4b99a0c76a1612452cad112c8792d66a407f93b384c6059cea5f5988a6
font_02_sfnt_off000113ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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