Malicious PDF — malware analysis report

Static analysis result for SHA-256 df384ccca7ec65cb…

MALICIOUS

PDF

75.1 KB Created: 2021-09-18 05:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 21d4c3f8effbcd6ac4956ef89a6947b5 SHA-1: 75df8d7a5b4bf26c67ab24dcbe6f5c7730c84bba SHA-256: df384ccca7ec65cbf9dd5e22c0363c5e69ecca54a2537cc77dd902312d0c2454
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and contains no readable content, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://jakpaisanestate.com/images/upload/files/55701349351.pdf In PDF document text
    • https://weekendtripskolkata.com/userfiles/file/mimovabudobevanagakek.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/90170333211.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210917115751_525268922.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/sewimimomubatexose.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614094c1f0ed7---14520131899.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/68180132855.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/14197573425.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426f7ba9bb5---89649908671.pdfIn PDF document text
    • https://atlantidegattico.it/file/xewezobolexuberoxule.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/dirujowofidimi.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/80272908574.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/bimop.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/desudamikunuwig.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/88281354477.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/23008371105.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/29579366973.pdfIn PDF document text
    • http://dominant.name/userfiles/file/rujisemowafivutorigunu.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/jatimotipolikalorolewezel.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/69402680342.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/bobuxu.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/girudezu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/irvhl1n4g333j32c4vgi7q97l4/63234695812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=redmi+9+telegramPDF 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_off0000c2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACE 10412 bytes
SHA-256: 577adaa203af49450109a0776be80a3ebe33c243c9013bd746fd746481ba7652
font_02_sfnt_off0000f22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 17312 bytes
SHA-256: b884d98eb922c814881c02b76a47ddbae5d9373cdd30b865296fc0388fa285a8

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