Malicious PDF — malware analysis report

Static analysis result for SHA-256 3771a1b7cfe2629b…

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 07:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0c474fd56f339551eadd5fcd3446b522 SHA-1: 44d8dfef00da4b8d7ce1c33f6a99fa44baecd874 SHA-256: 3771a1b7cfe2629b7f4c3ebd7144571470c91dbfa40bcc52a29b788ecf1ee461
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://huntic.ru/uplcv?utm_term=kumpulan+cerita+yunani+kuno+pdf PDF link annotation
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16096103bceddf---20730934124.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/pavolax.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/mepupizaluvulisixuvewawu.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/778f3a367e457179930410adba932934/wevimutazefesogog.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/5174012634.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa5b88461---4378593190.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/0954ac71db8f8d5ac9ebac0720727da9/dapatenuz.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/55285602877.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/11174463595.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/98110033518.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-11/20210611014826750664.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/rps3ndnff2826htc0mhnpct012/nusopokikuzoxagonu.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/13044409245.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/a0c5ae1191af27a29694d2bf9afeb619/60717735193.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/kq1ka44kvpde8a6tlshqhtk5rp/53926036120.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/79263229311.pdfIn PDF document text
    • https://landi-bg.com/images/file/89440208107.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/89950632220.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107030443369501.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/javajawukowepopamasufagi.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6d0981b94---fivanapi.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/zofajokaf.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b723885a7de---fivojekamufubebo.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/wozat.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/wuzaduvaturitulemifopowo.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_off0000d3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E4 16204 bytes
SHA-256: 56ca5abd4f81889295330918a03bc97d2709122678b338bba074985e3e41dbce
font_01_sfnt_off0000fe40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11657 10908 bytes
SHA-256: 37ea33df233ab1855f40f4168764cbdd2e0e1bac26f421442490f04705d4e788

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