Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b7635f2d01c651…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 12:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9de92b1ae3703ba89762c199aef10a87 SHA-1: b2e833d2d38625f2bb63beec3da61b929a7dab31 SHA-256: e6b7635f2d01c651c20b656df34f50ec0ac017ae2e47b8ed4f57c4f8b86e5162
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a ML classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sartoriaventurini.com/userfiles/files/9056052125.pdf In PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135281c8fe97---wipogaparajibobaxi.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/ginuvoziwavilu.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bb6e52788---28013353723.pdfIn PDF document text
    • http://wych123.com/upload/files/fupetelubemipixofuka.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613465adc4fd0---53229360957.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/bisidiwogozo.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/kegolifoj.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/69883688000.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/21597628565.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613298aa6775f---gewanozixatowiginixifi.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tokekuxez.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/zawisovujojukusuriloxog.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/89667055541.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/67812976116.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/raxogaxome.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/nofen.pdfIn PDF document text
    • https://music-group-store.com/upload/files/baserotadanifirivizigaz.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/wivatafewaxomofarepamuras.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/21602283217.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4fe210926---gisix.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/wuwufaluzasaratutiki.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/79568865151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=stick+a+flag+in+it+pdf+free+downloadPDF 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_off0000d633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD633 10880 bytes
SHA-256: b4a60bcecdf8c79e1bd16de9e6691f734f97d66a45d1f74c8338fc58431291ca
font_01_sfnt_off0000ef59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF59 18136 bytes
SHA-256: 47ca05e4f228794e53e90ed5a80150926d919981b5c2379488186b2da8af34a2
font_02_sfnt_off00011f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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