Malicious PDF — malware analysis report

Static analysis result for SHA-256 8460d3ddc0c0c25d…

MALICIOUS

PDF

90.6 KB Created: 2021-09-11 19:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 441e5acf7dd40427eb3c5aeab5685eb4 SHA-1: 06cf97435eff34fd4bd2353d73496514ef249cb5 SHA-256: 8460d3ddc0c0c25de2e4b8ce722080f1019aff37765ef940d43b3b31476d1538
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm to lead users to potentially malicious websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://archism.ru/uplcv?utm_term=the+walking+dead+ep+3 PDF link annotation
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba87fe6a6b---3063030149.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/dodebo.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/wawotebe.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/sajibasijubunigakuk.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/sogig.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/vulevobuzawisuzijad.pdfIn PDF document text
    • https://rintrans.com/files/tevizoserevojumokobe.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139775b47250---77610496565.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/87337794326.pdfIn PDF document text
    • https://masihpt1.com/contents/files/44351535957.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/meniz.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/pugasup.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/34048102762.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/21016490088.pdfIn PDF document text
    • https://nls.vn/upload/files/81773399773.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/67343625033.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/molagef.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/tuwadobutiwe.pdfIn PDF document text
    • http://podarox.ru/public/files/wafutepusaweka.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/9700ae44a4d93236f32faf11620a279a/29436153340.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/zegatigufiwaxajelitam.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/xawepilisu.pdfIn PDF document text
    • https://ibericadearmerias.com/file/45775967762.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/fumelixusadiril.pdfIn PDF document text
    • https://hotelcorona.ro/files/fomofifezawopulopoba.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109022304454217.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_off0000fb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB17 19116 bytes
SHA-256: 7c0eaec314b27aea62309e6b36b575b0021afc596cc782e9a400516d8a90ab1f
font_01_sfnt_off00012ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E6 10496 bytes
SHA-256: 0578f9d8d5888a4f2f172402dfdf00b6f96ad98df52400e4ab124ae233ca0fc3

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