Malicious PDF — malware analysis report

Static analysis result for SHA-256 1663c4e5516398f2…

MALICIOUS

PDF

87.5 KB Created: 2021-08-08 08:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e216556c62785255711d1653e7bddbd7 SHA-1: b2750d8c1455debde503def1e5cfc68cae39c8aa SHA-256: 1663c4e5516398f2b26e8b8b0bb9bffe2e6626713ac5119ca56353c7f0a056b8
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are confirmed benign, are part of a larger pattern of directing users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kuzeyilac.com/resimler/files/90077542369.pdf In PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942e61c773b---22225323531.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078605692c12---kefeseraruvadulenozuw.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/iq7jntuci9vm2vamd60nr84dti/narezig.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/82410773671.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/bopunufabebuwo.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071e00b22665---78233388268.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fd38ce320---57753074160.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/genirogowesotidopomewarej.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cc1cd4317---jewigofufuxewomizeraf.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/zukawajavujovog.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/2rqi9jub6vt8411h6cg5epi196/niloduwadubated.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/jitevebovezena.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/76600382294.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/lapojenijopelelubirizepe.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/32260648112.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/4vm6iql36689sibej0qa1puadk/49276054641.pdfIn PDF document text
    • http://whippets-au.com/clients/7/7f/7f5032e15db821a993a8146895416847/File/bojuruje.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/dajazipasapari.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/acfj4eupsquguddau660qol9vn/95618681456.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210610010128_wjd2u9.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/13985691649.pdfIn PDF document text
    • http://iltorg.ru/upload/file/bawivanokumile.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210611_AAADE49DD1ABB8FB.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/jozawavudosapun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=exerc%C3%ADcios+de+adv%C3%A9rbios+e+locu%C3%A7%C3%B5es+adverbiais+com+gabarito+7o+anoPDF 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_off0000eaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 19640 bytes
SHA-256: 346417974ead2cfa6c520341148d0623708cfbe411a8cf79e482ca7c7fe1aa43
font_01_sfnt_off00011a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A10 11792 bytes
SHA-256: e45325dd902a9b7488ee99a2b9ca19652b35cfc643a334f66abfc5ce5b3ea3bc
font_02_sfnt_off0001353a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1