Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c085d9597b9351f…

MALICIOUS

PDF

76.8 KB Created: 2021-09-01 14:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c7388c9b400a1d9265eb2336c84a948 SHA-1: 8c4a00c209e516b2f2e62950c3e74d381d174fdb SHA-256: 4c085d9597b9351f543f8a09e2b7ee412ba0f8f0ee0905556bb0185a81548fdb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs. The heuristics indicate that the PDF acts as a link farm, with many links pointing to compromised WordPress sites and other disposable hosting. The embedded JavaScript likely facilitates the redirection or further malicious actions. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://coretry.ru/uplcv?utm_term=anne+roe+career+development+theory PDF link annotation
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/1f8cc186709b1228669b50a2c6b849ae/32526424029.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/toridavunalifatifovixaf.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/49322124762.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/wejivivi.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/77789842201.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/50689709577.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ad7f2dfb4---xewagegedepiraful.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/f852f9122fe6caae6ffac4a9024320ee/10122625759.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/45921979441.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161140b1d47196---nipitulakuranunupe.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/dobiv.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/wujazurobutupuparumuko.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/d8926fe24b246dfb7ef8cbd0509f9650/detif.pdfIn PDF document text
    • https://polandpools.com/contents//files/dariteje.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/p4asklrfssm06o5tsh2ul1n93c/15700625309.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/otpaahe8kpsvis44oprgurle83/vefevazivilunofulofom.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/24506166808.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/67091628045.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087a5f88e510---vorosub.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/nuxotezujigoxolawo.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/93223517044.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_off0000c86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86F 10680 bytes
SHA-256: 53c4069587f5ccfff8fff8d02e5e01f0509fcdf4b6ab3607a00ea703f45cf9f0
font_01_sfnt_off0000e0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 17240 bytes
SHA-256: 549f14f65fe4c150c1de858192177d308c19e1ababe7fa3e28117de20a34ef7b
font_02_sfnt_off00010d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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