Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ace9753305ec78…

MALICIOUS

PDF

86.5 KB Created: 2021-09-07 16:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ce7a33ac91d1d2bb0d6b39d039c04aa4 SHA-1: 8b3f7e198fefbfe18cbe96a12e9780e6c713c6f5 SHA-256: d2ace9753305ec789696bec96133a180ba4d49c7007454cf8f8e6526707653a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript indicates an attempt to execute code, likely to download further payloads or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://allytemp.ru/uplcv?utm_term=shimadzu+balance+atx+224+manual PDF link annotation
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d22c7bb819---75884039014.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/migedezaxiv.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/160439765dc294093cf46ca525340636/10047694240.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/34978895971.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/weful.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/jonojodorowafizuzimorulit.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9fc7d1169---fijivamawilet.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/famax.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a15e6963ffc---90982570636.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab9a5e804f---lapoxedolu.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/50831137765.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/gajexalumiwifu.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/82465878379.pdfIn PDF document text
    • https://wrd13.com/force/file/5633704838.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/zifoxawanelepe.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/77226190939.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/20595111426.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/kebikamipabutenunamafit.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/10599597712.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65650638667.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/47406163089.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/bimazekibijuwoda.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_off0000e960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10172 18984 bytes
SHA-256: e3a05a8762ef3f1846b531297ee2d32135e0209e5556f861611404a6ada4a85b
font_02_sfnt_off00013329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13329 10920 bytes
SHA-256: 56b2d189c4bb472d55093d9b18cac9bb4bc9d8d01437dcc54f9e9e102453327f

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