Malicious PDF — malware analysis report

Static analysis result for SHA-256 432ac6b4b0224bb1…

MALICIOUS

PDF

76.5 KB Created: 2021-09-06 04:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b5a9eb93398e347e5ec8d0037bf810f1 SHA-1: 26f6793711a0f02d4fb9e45d4ff11af6c2671e6b SHA-256: 432ac6b4b0224bb1041ec99b5d5b79b03b8e1e4c10ea94152222a08967ff3088
156 Risk Score

Malware Insights

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

The PDF file contains a link farm hosted on compromised WordPress sites, a common tactic for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, many pointing to disposable hosting or compromised CMS uploads, reinforces the assessment that this document is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac337f8c2b0---zemevudonejedewizet.pdf In PDF document text
    • http://suarezbeltran.com/aym_images/files/21250291078.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fa8f96e636a---votizigajezezegumo.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609751e90c719---73997659520.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/67217108749.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/5122611008.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/senanubadojifomexonuj.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/bl7kaomfjoou8qc4ocv26liq61/zuzokikonafiviw.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/71289360511.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/9n3u45ajhifldatro73r70vn79/nivinosivitud.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a224adc6ea0---kebomudasalovoxigu.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e26b16c1ee0---96895033207.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102c39f89203---divuwidesigojepitoriro.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/45740048137.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/kirogerikup.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/nofepexov.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/96380573743.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5732cbf80---33505176626.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/99385081284.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/gvkhq5hu2r532nfv09j1o3afv4/sexazapewelowev.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607676f591b98---61600565343.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/04304c5ab993cb620204fba95422c96c/vuzijukixuvori.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/47272740207.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/2ae5fb64c4bec16094e819d782d1c30e/jafidazixutefi.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/94590771177.pdfIn PDF document text
    • https://parkettworld.com/upload/files/24352301125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=national+pension+scheme+2019+pdfPDF 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_off0000c9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F5 15608 bytes
SHA-256: ed3ef84fb5a46f4a37f75ac10cac7db7c84053d986f6941c48e8379a5b0fc36a
font_02_sfnt_off000109c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C5 11224 bytes
SHA-256: 95d626fce3232fa780d6d73543c8dda2d3140a754569c688280857852e8de315

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