Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ac75e66456e7ee…

MALICIOUS

PDF

85.9 KB Created: 2021-08-26 07:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4b09e4b6eccdc7730be8c6626a5c9eff SHA-1: 3c61c66493102291ab5d01aa30b024c5bd7b817b SHA-256: 85ac75e66456e7ee5b69d2cc286682c46f44556dfef79693eb6f767748893149
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also features numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nomylo.ru/uplcv?utm_term=interactive+lecture+demonstrations PDF link annotation
    • http://pzhjintai.com/upload/files/zidapawi.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/98731315257.pdfIn PDF document text
    • https://shiokuda2.com/contents//files/55349387454.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160dd8b871eb0f---gugabefa.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/68318669641.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/9890200514.pdfIn PDF document text
    • http://veitali.com/upload/files/wapoje.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/manofenofulupebuzorafuxu.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/84080626169.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/zafog.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/18513834423.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608832ae8ed44---30369535780.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/xenumivufojudovudobaw.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcb62829371---wegexusisegitonesapodap.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/9nlqdruatq89aa1oeeqq3rdm1t/98144222665.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/jufawaxavufimo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/52253273369.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c85d8efcf37455b23f43d4b88c53316c/wosuvefifakagifuzobomakib.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e088fc88c7c---471649016.pdfIn PDF document text
    • http://thecuriosityshot.com/34610925436.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/57407048153.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fd58f3498---77874641124.pdfIn PDF document text
    • http://zenithmetals.com/files/94542251257.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e46585a462685333c56befbb8fc115ad/lexilesetajo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/500dd0e536bcc5510af19044f49f6019/wupogefofuwebezirazorikog.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/63292032240.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/2331894416.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_off0000e8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EC 18784 bytes
SHA-256: efbcb0664ef9541d111e8653ffa04088f3366ff67c862dc4c1eca227f638e73d
font_01_sfnt_off000118ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AB 10648 bytes
SHA-256: f5c0503b4b438e8d48f29229ef7bf2cd2e25d0fea67a7a046e8ad32d62948548
font_02_sfnt_off00013113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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