Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe958cf51be6cab…

MALICIOUS

PDF

71.7 KB Created: 2021-09-24 23:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 20482a8390a3ec9fc20f1f86e1c1f2f9 SHA-1: 6a808d9373790131ef5a82705462de2748ef3473 SHA-256: dbe958cf51be6cab5fc27ffb666dc6bd6ff235a15b0b8b95481c683748a14743
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The presence of multiple links pointing to compromised CMS uploads and disposable hosting suggests a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://songhandiban.com/uploadfile/file/2021091019500873499.pdf In PDF document text
    • https://war-old.its.vn/new/userfiles/file/donebofof.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/nuvamo.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/gedajegeli.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/24916996281.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/jemanekoxivikapotabo.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/mimupurixivuwol.pdfIn PDF document text
    • https://krusomying.com/data/file/87956849470.pdfIn PDF document text
    • http://neteyes.eu/editor_up/biwez.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fab0137d9---65686918537.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/mupumavajutexisup.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/xigalegizepu.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/fumulakitosa.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/fajewij.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/rnb4au0qlgfjuqac225nivgge6/20343365431.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/pokawej.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/24992426446.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/98720102919.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/98101888323.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/2d3f7593448bb170fcbbdcae0b4ab80e/8258915066.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614cff089f872---32556545657.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/xifuf.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/17786561081.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/a34dfb0c87a0b0c94878b8a979bfbca8/48656035222.pdfIn PDF document text
    • http://gaudi.tw/upload/file/wazija.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ssrv4l032gngukmrlh5t1sq2l6/waluja.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/57917913094.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/nanumul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=scan+qr+code+android+10PDF 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_off0000b64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64A 17024 bytes
SHA-256: 2dd3787e2d6f69c2972523df5488733c069127d3b68d5e5b78c4d0acd3f772fd
font_01_sfnt_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 10448 bytes
SHA-256: 2959d6d28cb1840013647af802358a10956dd7f8744c698b1c1b07b10b1da989

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