Malicious PDF — malware analysis report

Static analysis result for SHA-256 d445b8617a256928…

MALICIOUS

PDF

87.5 KB Created: 2021-07-20 02:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 393edad8fbd795745af37e2779451379 SHA-1: 32ee2f8c337c5458f77d1487a2568dc0a08a53bc SHA-256: d445b8617a25692887405e274c2b425274c0e9cc93d2b0f7b692cbc46404b344
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign where the initial PDF acts as a lure to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c729068c2ab---76986416617.pdf In PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/67875845099.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ee3b1cc7f---vimugavopasunijoloxoxe.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/i6u7lbt0706422umu21ovjcapr/junulugogemi.pdfIn PDF document text
    • https://samowar.ch/upload/file/tugelidasunukiborebup.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/rakuvebutevokowabukubese.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/wetimitu.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0eb9a6051b8c66aaa3ff96d8819addb2/28810065967.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/42382788049.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/80122473054.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/kibizijopetilatali.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcbf3ca83c---95138460937.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/a51e016ebf709a755ebbd9fb5f34870a/21364407605.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/lukopolexenatifebixi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba3aec4877---ledawenes.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/44026535760.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-07-14/images/files/92517650821.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b099053097---sagalutep.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ca146f2456ead404e1fe03d2b5ba33d4/90992235572.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/4919940601.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3625d4478---xodep.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/29a4aa81c00679a8cf34c8c20b66c7af/gupod.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/mexezodesebat.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b13e0f6f633---68393380156.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/dosubokizoripuniga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=life+ball+resultsPDF 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_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 17412 bytes
SHA-256: 108c5f974de263f592c95bd0caa63eb14a431741f78c254d9cef69881148f13c
font_01_sfnt_off000121d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E9 10180 bytes
SHA-256: 0ba56e611c6e6ec38a834efc2190ac8cc5fe9d2a4b07dd56c12a560dedece700

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