Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78a0dd4f62d0edb…

MALICIOUS

PDF

71.1 KB Created: 2021-09-18 11:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7969bfc0b3a5aa20d9487b3ab84133ab SHA-1: 4fa4db0358eaff762fb701c57d83dc4cc7323c12 SHA-256: b78a0dd4f62d0edbfeea967acc432900255ca09475aa4add595f3b18ef5e4a1a
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 presence of multiple links pointing to potentially compromised CMS upload storage and disposable hosting suggests a link farm designed to obscure the final malicious destination, likely for phishing or malware delivery. ClamAV and ML classifiers strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://salocchi.it/userfiles/files/zazirawibor.pdf In PDF document text
    • https://tebra.si/userfiles/file/72520832243.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/93820389cd42c2d3e2de3f2f420e3a5f/notekinunesowuvafuxupebok.pdfIn PDF document text
    • http://opersan.com/file/sepanisezanimetevesepas.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613251957266a---vemirifud.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/10866352790.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161459356e28cd---19846064840.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/7km3cl5bjblglohr1rp3s6it6c/mukumiganisosobofusik.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/norosoneluteronidopigot.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fcde3e064---vobonefuguwitizodexedine.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e98c707de5---wamafazojad.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/47049328961.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2bb727fdf---wixipugireluz.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/92915644271.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/tikekepemunina.pdfIn PDF document text
    • http://3sdent.com/upload/files/xejomuditofonero.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/moviluvosubepasatumuse.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/6967056447.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/10733084186.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/67586273685.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210909093453711298.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/89319133312.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/18243997491.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210908093743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cache+on+my+phonePDF 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_off0000b901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD113 15400 bytes
SHA-256: f1c88f71039ec4bbfd6bd4f16eef5be8bc7ccb2a75367279effdf9ff04143351
font_02_sfnt_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 10280 bytes
SHA-256: c17c58c9f9043aee1b8de688f9f3112e7d01783ae3e3f38d4b6901dd10c669f2