Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b67f9f1257656b9…

MALICIOUS

PDF

76.3 KB Created: 2021-09-10 01:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fdc7fbb5b92a1132f85c0be3e75a77bd SHA-1: 177b3835f07b0ab24d5e062ac5b3621e345aeb93 SHA-256: 7b67f9f1257656b974ab2529fa9a688fcfb88a79fb2ac53a6877da63a1fc270e
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates an attempt to exploit vulnerabilities or execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ecompletecontact.com/ckfinder/userfiles/files/fibiwumumopefu.pdf In PDF document text
    • https://pet-fashion.ro/mm/file/79603200924.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139271fa77a2---bozabopozigo.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/37702051532.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/vimebiredaxojom.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/rejipador.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/lejavudexanuzobewage.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/33998338367.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/96717118938.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/15820432393.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/waxixexuseperatazozoxo.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/vevefosuvudiribu.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/86767534501.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/zexejowe.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/xigimegexax.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109022209493606.pdfIn PDF document text
    • https://primer-spb.ru/files/files/65456802561.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/73170121580.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/tadaxer.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/210a63f7609ebeabf07418a0c85aa9b0/86386588696.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff2d116fbd---43832355085.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/sabuguxewenijemuwobasada.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/nopibemipinebisejibulob.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/luserulofiguwurajobotaral.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/lujopudurum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=transport+layer+in+computer+networksPDF 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_off0000c6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AB 10888 bytes
SHA-256: d709a15d6a24508f404b7eaeb4b90b1a8e478d960861fad4e3ee8ae3ee65435b
font_01_sfnt_off0000dff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF2 16860 bytes
SHA-256: 42af974bfd46d71eee028d684f3ad98a94a65722e0921735ae8d69ec26951e9d
font_02_sfnt_off00010b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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