Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b6f75625b6c5030…

MALICIOUS

PDF

84.3 KB Created: 2021-08-22 11:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e0cb0cd227d986bb36b7c42fd715c616 SHA-1: 2a0cde2c648c642b486abee6b556b3cfe76cf467 SHA-256: 1b6f75625b6c50302b89bd2dd55199bb8d2fe874f73afd8909b93b1509037f62
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=k%C3%BCrt%C3%A7e+mevlid+okunu%C5%9Fu+mp3+indir PDF link annotation
    • https://samowar.ch/upload/file/dofozetipupifotik.pdfIn PDF document text
    • http://prograsifkalip.com/files/98120494965.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/928f5f9d7847a4c0e1aaef4fc1ba67b8/60627175139.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/30e12864b0385688ca5fa31cec7dceac/lugemilinegidu.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/87847914163.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/32257599494.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/4q4bdg6c626d5r7g1pdt28dfh4/wisavefisomepisarodux.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/36819072809.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/67070660836.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/e790bf84868e452c49d72c60058be26a/32958846977.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/566e019e7abba9e86c3d019a00dacfff/54803320715.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b87638cc21---98826609387.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/77da7aa3c6b2a4244b0f38f1d2548d1c/wunaxeb.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210715_EE30761E3416AC0A.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a864ed5562a---80816746189.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f92756e82f---85153968608.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/mawalepedepikizovujimep.pdfIn PDF document text
    • http://www.provinces.cmcgeneralate.org/files/js/ckfinder/userfiles/files/96603121981.pdfIn PDF document text
    • http://microlana.com/ckfinder/userfiles/files/78303007968.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/kifujugufinul.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161103101f018a---66005116783.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/71813822860.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/dirs3dfs5qjoohjmm8ifbq1rr3/31272377106.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/90b42c2b76cef3e0c6fb66ac77336a21/21448270967.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_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 11276 bytes
SHA-256: 715d70c1f75c664720c43ea32b3ca044a839d61b6092ce0cd0889dcae4a8a0b7
font_01_sfnt_off0000f89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 19904 bytes
SHA-256: 55389a684ae05e7c8cdd6460a0039f805056fbcb5ef36ce3b621c47262df3fdb
font_02_sfnt_off000129b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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