Malicious PDF — malware analysis report

Static analysis result for SHA-256 acac48844f6dbb84…

MALICIOUS

PDF

84.1 KB Created: 2021-09-06 09:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ed820900f4aeeb667f6aab0d0c4e7ab SHA-1: 5a626ba5221b1de5759fbc63d74cbc98b2f227c2 SHA-256: acac48844f6dbb84c3e9d325432702ceca2731bfa7060a19362b9bc04d4a2308
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, directing users to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate 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 lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=schedule+ii+of+companies+act+2013+pdf+mca PDF link annotation
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/vfp2orrk1c5cso2q4k80dpgsq3/fuwases.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/fijenuwako.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/12747478474.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/futogo.pdfIn PDF document text
    • http://leesfeest.nl/leesfeest/sites/default/files/file/92974895966.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a67d53b35f5---pijupi.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/76565462330.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ivmhfn5mtik19a7kpqa6ip8h27/kinolurutege.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4c2f1d394---tobejubi.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/puxevususoja.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc984d6c705---21736430827.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53d0dd9025---72713850429.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/bhj58p4bj0g5jr1cfdnvjnqnt0/95348124207.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/23651875587.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/kerbcvk2pc4sbfhmku331e76cn/tivekef.pdfIn PDF document text
    • https://fultoys.com/userfiles/62545332553.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b412270df69---fagowiliv.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/0353e538d900b59d08b49aab616e82af/26073076975.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/49278445694.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c796a73ae6---nizuto.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/o8qbg05erl8ul81db4a9nbb7k4/tegasobozigeganabudeduvi.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9d42b0719---rabive.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/26cb43474f4e0ce35d9b0885da0e0bff/79545031534.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_off0000e1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 11428 bytes
SHA-256: 47549011b3a8f409d636841074afd27598d86ba0736943958cdb662429834b3e
font_01_sfnt_off0000fccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 17848 bytes
SHA-256: f458324577953e041a51c55740b268349dd9977239f31e992cf2bab89be6bd1f
font_02_sfnt_off00012a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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