Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc113cc0f359fbdd…

MALICIOUS

PDF

89.6 KB Created: 2021-07-06 19:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c462a6b175a9746ad349bee11d383a40 SHA-1: 687863a4c1bcdb307be6662fbbbcf08a3c14bfc2 SHA-256: fc113cc0f359fbdd6559aeaa8351a060b7d34b1913c19dc2aef317e454479c01
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 functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/64ea62a66dff7b424c8e42aae93e4095/45605802348.pdf
    • https://liniagdanskzydowo.pl/files/waderesodup.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609666931ad46---nawosisogikabenalajewarep.pdf
    • https://ngusacdon.com/upload/files/35886333697.pdf
    • http://dgjst.com/upfile/file/xuzodudajuwixukaniloful.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/49315084137.pdf
    • http://bright-mineral.com/uploadfile/file/2021052011174050.pdf
    • http://vattucongtrinh.com/userfiles/file/50175451313.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/00993ed3b0eb3fc6049b993b2816bb94/49514856628.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082fb802ecf8---29901339017.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9b26ddfcbf4ad71ba4592ff3c8a5ec6e/delukasepivobodokure.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7de71bbf0e---21017666084.pdf
    • http://learningkey.org/userfiles/lokipuni.pdf
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/mekedexubarerelofemi.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8c269551a---dubirepikaxiwoloto.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d55664c08---74340430706.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a337d5a5f03---sonotuvotigunefa.pdf
    • https://vienhung.com/webroot/img/files/bamit.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094600f569fb---pipamogopisumofigivon.pdf
    • https://baongochoa.com/upload/file/19665891170.pdf
    • http://anandtouristcorporation.com/uploads/sikewetuvefagokaj.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160cefd0c1b0a5---34563416649.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/2a8532f8c713a7b4bd7aa523f2dd9a36/1813240082.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=baby+breath+smells+like+spoiled+milk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f96b.bin
095a97b4de476bdc4d76952119ea853fa3b63a702392810e0096d6dcd2a39b10
pdf-font-stream PDF embedded font (sfnt) at offset 0xF96B 10952 bytes
font_01_sfnt_off000112a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112A9 16792 bytes
font_02_sfnt_off00012abb.bin
b7bd360d7ca84187f1ad319f5ce789af26c9156a0860bd936f601e3e81aa742f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABB 17116 bytes