Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd57adb88a71efb6…

MALICIOUS

PDF

96.6 KB Created: 2021-06-27 11:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 296708e6cb7060920ff749b6218274a1 SHA-1: aed04e31a64eeb996510098fcc0eb746eaed1a31 SHA-256: bd57adb88a71efb6a297b886971681ab10b3e663418cce81c054eb080f3f2979
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing users to numerous external URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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 http://izeninfo.net/admin/upload/files/mifipifejisigabukijiw.pdf In PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/gevibogogitipetow.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160818ff24bb4c---41783075783.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/26182121472.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bd6d7a330---56203610336.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/gixowoguv.pdfIn PDF document text
    • http://phuongninhphat.com/uploads/userfiles/file/bapuwir.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4bf549071---81470348096.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ccd3b7af0e0a25f34f499213df92461e/23207259406.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/e544c26d038cd6d0ba184b7e1047e12b/51713450425.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/85818942bc7eca2f785bb1322cb6df4a/pulumobabudadanokup.pdfIn PDF document text
    • http://abwrva.com/uploads/files/30129011900.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91e9097a6c---53015054462.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/xagixoluwuzuzodopezakuji.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d7823671d85c9d44bbb27d4b090c08ec/lipidimep.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/20052246439.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5198e620e---96835396657.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/29842132842.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb479fc6e25---57801383554.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5ba0a9f63---69045987372.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202105290529513818.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160aa343fa5076---silegegabaleme.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844813d8cf5---37137789953.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/vavorixilidagila.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/55567310848.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/80370234856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=roguelike+deck+builder+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001108d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108D 10656 bytes
SHA-256: 5ad0337a6fc739044962233eaec0bd2022cdb640d4ad106d0ac511ec7499efdd
font_02_sfnt_off000128c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C8 17956 bytes
SHA-256: 92fbe7d29f62ded1df01e2fe6ae42b759134f90b48094e7d100a00e7e14615e7
font_03_sfnt_off000156f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156F3 17796 bytes
SHA-256: d848daeeb144434962b4500731d58836cb9924e43d2f894a0f1db5ba54b81551