Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba75e806a21c04c8…

MALICIOUS

PDF

70.7 KB Created: 2021-09-02 10:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb007702146a56e4fdd11450268e2222 SHA-1: 54abd44d89e6a9a248209c7efbca733e164cefa8 SHA-256: ba75e806a21c04c8ee216026aa7ac37d4e9bd388969d6b26a77980aefa09fcf8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various URLs, some hosted on compromised WordPress sites and disposable domains, and one even using a raw IP address. These links likely lead to the download of further malicious content, such as phishing documents or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://brukikostka.pl/uploads/page/file/vofasixomasagabezo.pdf In PDF document text
    • https://peilimineko.com/userfiles/file/bijonugebejuzeterijivijon.pdfIn PDF document text
    • http://wernitznigg.at/files/34196028963.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7e0cfe95---pepetojipudixisivamaz.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/sigag.pdfPDF link annotation
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/62645403446.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc4cca5160---nadika.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/wobozibabupopoge.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092043d2b306---sugunirudama.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf01ed507---35712582865.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ae08bc5ecc3879456f072a1a8a62f083/zavamuko.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/xamuke.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/suxibosomadeso.pdfIn PDF document text
    • http://peak-experience-japan.com/68321932323.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16094d793e076c---35968466055.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/2a1286cc9ce647764990ef7c2c54e3e2/jixifujagodakolesonod.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/dfc72ec105ee1ec7a3c79d4d8d50216c/wesimebi.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/sizivijobututobez.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fec2ffacd79---xovigelozanin.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161092cd420e4d---55429362899.pdfIn PDF document text
    • http://lu67.com/clients/50962/File/pajofewazifidepos.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b452fe4e90---56419806486.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160df3d11baf31---99276537065.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/xagoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+do+well+under+pressurePDF 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_off0000b8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F5 10308 bytes
SHA-256: cf368ba2923174b221816cb073663bb3b70ff327e651cdb96b9282e77be8e6ee
font_01_sfnt_off0000d056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE868 14464 bytes
SHA-256: 0017d22dec1aff0225c163ce87b31847a45aaa53acf1aaafeb3d1c2e18d17eab

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