Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5844a9bd74988d…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 05:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f8245a9f16d9e4c4709d8f8146d2b4d SHA-1: 929668eda1fb0947b1beb81e8fc9b9348a0137a7 SHA-256: ad5844a9bd74988d05469d52db40a2d491c29f484260f07e1f7534ea4fee3e59
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external links, many of which point to disposable hosting or compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://terhautz.com/upload_files/files/94516808385.pdf In PDF document text
    • https://rrrc.us/userfiles/file/pazaguterimaziti.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/35257309065.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/79059206211.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2e5bd573c---pakafavajil.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/xozus.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1b95edbcd---26610662746.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/73468675188.pdfIn PDF document text
    • https://pecsikult.hu/files/file/92893742156.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/92162350753.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210908093441.pdfIn PDF document text
    • http://xycrusher.com/d/files/9437185266.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/37671041062.pdfIn PDF document text
    • https://electroagro.es/pub/files/najadilivawinikagejizeri.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/7664608b7d3cf462a0d68a0fdcc0ba22/nanuzefoli.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/97493361595.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392be93f344---zusev.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/tisupo.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/vodejenipalemexurinubo.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/83330822928.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/girewo.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613551442f5cd---82038216991.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/43f2879d92586a78e3b70415a14057cc/teluvixizexunugedebu.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/zexerix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=modded+gta+5+onlinePDF 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_off0000d950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD950 17740 bytes
SHA-256: 98c09f14e0c6a3afe0d9594ee0cc78d73561023cf47f798da1010f21f7bce03d
font_01_sfnt_off000106a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A8 10280 bytes
SHA-256: 184b83ab0e450f624beb3ba47c2b47354f5d02bb60f146853003fdd486f1fedc
font_02_sfnt_off00011db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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