Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d7af04828d5c17…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 00:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 63d9b7c60b43820e3b22cd2c233d273d SHA-1: 3fe4327a9a8019c879480d316d6d4fec72f86de2 SHA-256: 94d7af04828d5c173d19365d59364f3520379da7d8337c5006286e05220a8f3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://szjg.hu/images/file/mogedama.pdf In PDF document text
    • http://villkasz.hu/editor_up/podavera.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/52299751822.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/28312779611.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465abda9dea---zugubidajakadavikafij.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/zudotur.pdfIn PDF document text
    • http://ingore.cn/upload/files/38357692432.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/91cb1728ae250b184e4528395f02babf/wazarupuv.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/72166349980.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65582460578.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/39989134844.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/967bc68cda4c688a4851d451c932665b/69456044563.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/77049325466.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/bb885fda716101f68c836d99fc285c8d/linukuluzonobokunax.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/xifuwawupizixe.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/vigutozigusijuk.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613248e87b1ca---83839638880.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/65359639316.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/50397509627.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/nifizotovatudafomedutorog.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/50298589658.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/vibakemeb.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/74918718723.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/12446479979.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/pijemofawuzojaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+search+coordinates+on+iphonePDF 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_off0000d970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD970 18508 bytes
SHA-256: dee4b14c286d007363dc38a1e82afd492a4db4f4ee160769b89b9c83ca5ad51e
font_01_sfnt_off00010a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001224e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224E 10644 bytes
SHA-256: 0ec580f2c355d9e3f6a20bbd6ffdd032b3b98bca62e7de98e43c6dd59eb6579c

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