Malicious PDF — malware analysis report

Static analysis result for SHA-256 4230a0b957a2a25d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 02:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2ac8b7b91f45a3c5c20942647967b09b SHA-1: d296e7c132ea099983c6dafc26816440e5cfd43d SHA-256: 4230a0b957a2a25d2b0943c63862d4f9b6feb5ae126394b93b000555ebe86b26
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, with several pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of 'utm_term' in URLs suggest a tactic to attract users searching for content like 'it chapter 2 full movie download'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=it+chapter+2+full+movie+download+for+free PDF link annotation
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/674ad74a5628110348eac41b53966745/sitokizadaji.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/85834275459.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/3068227674.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/d3d952tqbihq059nmkrd2rhji3/tagumubunevumixiruvupoko.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/tapaninelikuninifujew.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/fomabofus.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/48309212f708ad293550c65f898105f5/65341984165.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/zurirekegasobanonilifik.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/66654958004.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/28338401852.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/36297404162.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/cflvvue19csseii3oqfp5qm71v/jekarebisuwofu.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/gusifipotenukujakujegega.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/86514830596.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/vozaxikefogemud.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/7c0ee363e060c7270f775a72cb59d85e/39142512652.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/gegitil.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/fazuxifavolatekukun.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/23362850715.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/pivofitoduso.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/jadizubute.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/94251814000.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/25029582527.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_off0000e0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 17692 bytes
SHA-256: 7b5d489089c9062d3a334fbc1c32fbfc25f71f5b214456c603bd54ed2854c32c
font_01_sfnt_off00010de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FC 11040 bytes
SHA-256: d874c297139526a308971fb3943f6002913d1c5fe9b0f743c4312d59c5abe394

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