Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c312c0ba6c54ba8…

MALICIOUS

PDF

72.5 KB Created: 2021-09-19 01:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ec1ffec99d3e0df9383a8919dd859aed SHA-1: 557cccba7f65e6227c5891606ad3232a2aa65083 SHA-256: 2c312c0ba6c54ba87d410faf391099fb926add3c79841fcef1cede52dc4ab714
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140dbed2f6a2---90108167208.pdf In PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/niwinedu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16136f43fec55c---vupewenefokilezinogar.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/70116793164.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/50521457422.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/4449545003.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/jefutute.pdfIn PDF document text
    • http://metallpress.info/files/daguwipewinak.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8fa19fade396660b23d616b2aca2d035/mokewoweg.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614665755c297---14558664779.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/87848982747.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/xidemuxobudavemureranamu.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/74642702970.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/fudolujutugepolililibiko.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/30783682842.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/wajatesefokivizusofemepi.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/91995068813.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/nitedunagaji.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/10381501639.pdfIn PDF document text
    • http://sro52.ru/uploads/files/62763239511.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/dofidir.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/83986141939.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090420302945.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/97090580059.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/35515104030.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/15943054156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=iphone+12+pro+max+price+in+bd+2021PDF 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_off0000b78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78F 10952 bytes
SHA-256: 96cc41a2186853d9e70bd244feffce57f98f704491f5c069392c12109f0deef8
font_01_sfnt_off0000d093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD093 16948 bytes
SHA-256: 3e23c5dae5e873700df54d733e854e49127eef97b90e2b37dbbc3f7f7bdf1377
font_02_sfnt_off0000fc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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