Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5978834919c8d4b…

MALICIOUS

PDF

76.2 KB Created: 2021-09-08 10:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8224bc056ead7e798aaf58000dab2b3 SHA-1: 120e1ec8a41ad6446b33557bc2979688b7eff900 SHA-256: a5978834919c8d4b6c3c2ca761b9ac9fbb222c0162635f082c337918d5f041a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics identified the PDF as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5b374c49cf6f1fbbc0ac8e3781c1c8ad/29633983574.pdf In PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/tepitarexiwijab.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/95067657381.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/visomegaxijamax.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/7497907387.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/nefikoro.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/xaleputatewororimosika.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/635bde375ebc2511ca8959a36aff031b/79641463485.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/72264494328.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/57466396662.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abae1ff4136---14310067977.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8ff50166---relaxanana.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/25636212388.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/65249794758.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613689f214d3c---33010278616.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/keximemu.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160711f7df2e0a---nofunagogunogedeveneluw.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/wiwetejoze.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/biguzu.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/pupuxitimefiw.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/67179616513.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/weberewaso.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25b70daa48---gizavujojegorasulemo.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d464d22c49---xelufakenerenavim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=errores+y+barreras+en+la+comunicacion+de+enfermeria+pdfPDF 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_off0000c06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD881 11020 bytes
SHA-256: 86201667f7456317a6a4940193f33b94a583409dfe70b2a548a33434bc66bf46
font_02_sfnt_off0000f1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E1 18684 bytes
SHA-256: 04373d94a8bd1cf7a03976c20394ea57ce0c4e69bd3b0059aac50c835fcb98dd

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