Malicious PDF — malware analysis report

Static analysis result for SHA-256 320fc6078f5002ec…

MALICIOUS

PDF

89.1 KB Created: 2021-09-04 02:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8a6a3573b8949004c552bf1a13fadc2b SHA-1: 370fb172bc6af574c94fc04808a7fc68cb8d85f9 SHA-256: 320fc6078f5002ecc88dbb5c04dbb12a358b0e67d1a253d39960cd7a9b12028c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV heuristics strongly indicate this PDF is malicious, classifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/e6508c584479ae870a6fb1ade60eb54d/repijazunulotiximemopud.pdf In PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607689f05e130---33485817175.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/daxufikedafogav.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/722aeb6fcad912e8e712cccfdb3f0527/79712458831.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/gavozepalosowitoka.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/23248955431.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/81521488fba7ef6c4bd0e0cfca85c7f3/jabixukapevax.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef4d377edc---41807663088.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16096d3d19a118---75826418113.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/ff661f18a18ef38e7b7c412c3b790e2f/sirokipezulav.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/bogixodetinusu.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/68701204727.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/72885740028.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/42632001830.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/setibeze.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5c0ad9aa5---65996460212.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/kuraxipiputibogobakipo.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/nuzizusebosowebigekumuru.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609be184d2f5f---sizoziresudag.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f88e6e8d8a9---xanafisadepejoboranovez.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/l7a6dkrfthuq0j4juloco7k3o0/zeguganelodelezatuvex.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/85392112173.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/29475686496.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/59223486905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cisco+packet+tracer+all+commands+pdfPDF 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_off0000eb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 22060 bytes
SHA-256: 2144a598efb2dddd0f43bcfbe901d7145326df902d4f8619aa0cb557f7ec05a5
font_02_sfnt_off00013d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D40 10904 bytes
SHA-256: 15ddca05f5d301695ddd27157554cc551a09d11d9e09d14d2d79b6a927e9b601

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