Malicious PDF — malware analysis report

Static analysis result for SHA-256 417aa980b86e5e2f…

MALICIOUS

PDF

85.2 KB Created: 2021-07-06 09:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d1d145e096f4090c9724b0e9ec0f56f5 SHA-1: 3cbda804fc1a012fa0eecc59524c70afb4488886 SHA-256: 417aa980b86e5e2f432dbb7fc858425dbb4ed6aa489ab187d477a88248a368df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via a spearphishing attachment. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=ecological+pyramid+always+upright PDF link annotation
    • http://dalaichau.com/files/80439213460.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160878e4a3b658---79783617108.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/wonaxisidotomulewer.pdfIn PDF document text
    • http://flomojapan.com/upload/files/xopazazixusofexos.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/fc5dd5f331aacd77a7d1d781180a6e84/39516055280.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebda8437bb---sugapamo.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/47358045231.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/jibalaferujujopubixap.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607417de84258---71106618412.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/mvl74g6l5p05eap3m0vj4m2362/88087971056.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/l7v07mv45h4adijit6uf174eu7/84962651341.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be095d4278---lovubijigagegomaru.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/vojifatopibatunubemolomin.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5123c39b22---95240274357.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/903099547.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/15062f5fa569f5f9792815bee82bd076/vixevufebagiwezo.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/voxaz.pdfIn PDF document text
    • https://lemanssrl.it/file/lunel.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/6821590319.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffddf2e249---73737510015.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/kawutupitetiwixopo.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/foxumeko.pdfIn PDF document text
    • https://wsbtitan.com/images/file/15018472488.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_off0000e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 11008 bytes
SHA-256: f326e536817cb6a0f87ef5b35ab1ebe8ba81a67c1a2f43909e495b268d5fddeb
font_01_sfnt_off0000ffa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B3 18160 bytes
SHA-256: 4e6e4a46916886dcdf9468413dc3b75e47e5d72801ff15740d64319f78969330

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