Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca9842a99e09f09…

MALICIOUS

PDF

80.0 KB Created: 2021-07-09 04:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fdbb3b7bcf6abdf59eacee8174a91b1d SHA-1: 08b12f1aae0426590a43beb5a9be23fbf0727389 SHA-256: aca9842a99e09f099beb9e457ac449e4fb96c7c22cf14a0e08f421cb46318625
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, indicative of a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests malicious intent. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/2a76bfed3bc83e7b973aaaf71eafbbd7/41694654436.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160835d309c201---pujozoloparebofituzovux.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/d86rnbenrrj5e9a1scc38vmf2q/zariwaruxuzix.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/69427068796.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/nemumenaluzabibuzegejilaw.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/99225125136.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848560b5c75---rurekaviferetixegaxesam.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/11639619368.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5f0babb4e54705522328b2412bf299d4/70778571447.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/24084283125.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/nadesatiwupa.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086479414190---wozemisapadutataxidib.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/11385309009.pdfIn PDF document text
    • http://vodnik48.ru/content/file/xasusiwedenogemutixesu.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/vosiponoziguvugotupu.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/56954898981.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/png23ep1c8tbc0u9mv61otkai3/samizejeluxulimiban.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c5561e091---vulidovakeguvatunob.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/fonixagajijan.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607986dba1333---31062944284.pdfIn PDF document text
    • https://sinarwaja.com/account/files/85610898093.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a016fcb0ed1---79307194855.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebc8bb9e92---dilegimuwiboveked.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f38d5bb6a4---58093769565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=before+anna+todd+pdf+downloadPDF 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_off0000d4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EC 10372 bytes
SHA-256: c7fa4a1802823ebaa922e9ce44070d5168b1808aab566c46c7509efae65fc3d7
font_01_sfnt_off0000ec93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A5 17796 bytes
SHA-256: 4eb682974e1c7274e63364a481311048bf3d88b91092a302084196e63ca288ee

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