Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fb4384613c7347…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 18:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0cada65a329c71ece40fa6686caa8160 SHA-1: 069fb1577abe65ad0846c320373b99beb5e486d9 SHA-256: a0fb4384613c73475d8e50114ac549f5220cc650b430e491f60dd51608b8e88e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external URIs. These URIs are hosted on a mix of compromised CMS sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further exploitation. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://philabc.ru/uplcv?utm_term=0123+movie+site PDF link annotation
    • http://plusk-car.com/js/upload/files/43548291681.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139cc8c7efe1---55365609822.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/38815887067.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb1a69709c---josaketeberapifidiguj.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/zaximuxusuzifexejakub.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/mivenarirutuzun.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/69080295279.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/7451501562.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/79738797329.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/455738472.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/77484899294.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/27270661695.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/75338593861.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/waxepedu.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/68882718723.pdfIn PDF document text
    • http://nanopena.cz/upload/file/nojipulesoded.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/64797809218.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/ginavibufijakasixesap.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/suruziwab.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/zamozajetibuvuta.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/novibisopukalojafo.pdfIn PDF document text
    • http://tradotel-riviera.com/file/molamoduxobirizezamasexa.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613970603084c---19047057578.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_off0000db10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB10 10292 bytes
SHA-256: b6f00921304d8aa710381cd7afb134a5bf5a19f6713fc69dbb09c7dc35f71abc
font_01_sfnt_off0000f25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 16916 bytes
SHA-256: 65820ae416d7e407afba80a77a52f7c05e0b1b6422ec84d9c4ea05770a898064
font_02_sfnt_off00011e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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