Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbec086ac9af75b…

MALICIOUS

PDF

72.0 KB Created: 2021-10-04 01:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 39801c22c08dbeaf954a9b1e1755c289 SHA-1: 1b85d63a6ce89a90df9c8571ae10cfbd08d39011 SHA-256: 7cbec086ac9af75b968ad7bd1d5b1fbb5dfc684e56507abcb89e60e647ff3641
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URLs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://drafthe.ru/uplcv?utm_term=sample+email+for+asking+information PDF link annotation
    • http://sweet-sugar.de/images/uploadedimages/file/lanekoku.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/gejoxomivojedupariranefox.pdfIn PDF document text
    • https://csodamalom.hu/files/files/marixobu.pdfIn PDF document text
    • https://docommerce.co/calisma2/files/uploads/51427481306.pdfIn PDF document text
    • http://scantech3d.com/files/91290905541.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161304489dfdde---bumef.pdfIn PDF document text
    • https://grnca.org/img/files/files/sezawulerisusap.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/18298963461.pdfIn PDF document text
    • https://kerryparsonsfoundation.org/media/file/wadasar.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137fb4337e52---revaroxiduzojinatezut.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/xalobabukepurotoziv.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/lamuluruxigiri.pdfIn PDF document text
    • http://carszana.com/image/upload/File/nivoxowazuzirimusuvu.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/jijexinewenesibes.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/52710227490.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/35864139327.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/76713654821.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/67403c8ff7c046bf4d23a5e86b031b04/42814490500.pdfIn PDF document text
    • http://azizolace.cz/images/file/mavixipatumekivurex.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/62013962731.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/nufazoxopu.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/xosadubesegerawukutixew.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f59cfa4492---guwowutobotufuluxulu.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/pibesilezalizaxesokonaf.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/lofiperiladelodanuka.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/77690226104.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_off0000b357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB357 10868 bytes
SHA-256: 8209f0ccda63e34599161457f6e61c0c75e23a92c9fddb6fbcf3f6eed7cb31f8
font_01_sfnt_off0000cc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC63 17488 bytes
SHA-256: 953dfb2a6c842c38a730e0bcb780c48977c71424cbc5ae3ed4ac791918c0a99d
font_02_sfnt_off0000f8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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