Malicious PDF — malware analysis report

Static analysis result for SHA-256 8382b0d40464b36a…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 04:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2f93efba1ce6e38ae2f2b384c5ec1f07 SHA-1: 5d381d119808b8e38060a9f6e2031a5945ab8a0f SHA-256: 8382b0d40464b36a7ebad7f9e349555cdba6214ac188573af42e5266c9ef4193
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm designed to manipulate search engines, likely to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=waves+maxxaudio+apk PDF link annotation
    • https://leciv.fr/uploads/FCK_files/file/topujapojevax.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-9/20210909065635689053.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/25135958483.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/fubatanapevemubalupufujab.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/93507021113.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210902200721.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/tididuluwija.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/43989077164.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/89469911765.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/dixizojonizusesabetibasa.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/70233206067.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/zuvojometixizi.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9fde0e1a---90797650159.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/6b59ba260bf6c0a09ed72761d4fae689/69388097749.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/69063668268.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/limiveromiposimigutut.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/xamisanividijulu.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/velifimawivoledirokitija.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/95061114999.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/bojadapet.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b0b0e366a60ca54ffaafa392108984e4/55165536886.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/lk54hgi1vlva65kf7s2ckj36cl/tajebowonewikawuzazen.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/pitubademenefotedida.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/gidasarebifezag.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_off0000d3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FC 21828 bytes
SHA-256: 012a60179dc23958393c69de430fdb75f2df55743b9b08c2b1b86a9d8490f8f5
font_01_sfnt_off00010e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1E 10556 bytes
SHA-256: aef879904fb681fdbf75496d6a526641560e134ae8329cdfc891e9e90a14b30f
font_02_sfnt_off0001263c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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