Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4c372afaeb0b90…

MALICIOUS

PDF

72.9 KB Created: 2021-09-28 00:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c4119fa0e5ba30f2e156c55d0893a7f SHA-1: 31a520d9383483b86eb9585fa85bce16980d7c9c SHA-256: 7a4c372afaeb0b90a925ab06268388d8e051d2bf38aefe820f9d36d45cae1c2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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=bonnie+simulator+apk PDF link annotation
    • http://siblom.ru/files/upload/file/gixadurorovof.pdfIn PDF document text
    • http://sgpeo.pl/users/file/74401022482.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1c0c2db18---wapunak.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146a974f0865---93568911611.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0cac257b2---45141164831.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/papofonuf.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/gemomata.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/9750437167.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/jazawivotodaxoxasat.pdfIn PDF document text
    • http://ontozescentrum.hu/tmp/62055814580.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/97242702888.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/kibafolilikevupo.pdfIn PDF document text
    • https://babycloud.ro/app/webroot/files/userfiles/files/19954777789.pdfIn PDF document text
    • http://immopolignano.lu/images/33228568738.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/27614154544.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/serev.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161435b4de12bf---duroporokepopadinuxuvi.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_off0000b622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB622 10660 bytes
SHA-256: 67e9b9c64de913f339ab866b5d3d42890e8779f641f8b5c400e1950d75c4c6c1
font_01_sfnt_off0000ce8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8F 18440 bytes
SHA-256: 92c409b2ee30a35bbfdf30c3e2d0b88ffcca47b9d0c55b073c13840bde09e6c0
font_02_sfnt_off0000fe9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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