Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4463dafa7f96f4…

MALICIOUS

PDF

87.7 KB Created: 2021-08-07 01:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e062a2185f8b7a3ace7042b89385b854 SHA-1: 10951bf9bf85d87e847ab1045fd036e29687649f SHA-256: ad4463dafa7f96f4e8cd9b1fdd9808d7b62e5417acf3d89da303b4015e52d93d
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to manipulate search engine results or distribute malicious content. The presence of these links suggests an attempt to lure users to external sites, aligning with a phishing or content distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/mabasepujaxe.pdf In PDF document text
    • http://www.urbanwaterways.info/files/kijixuvonisavibowawuk.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee92ce54a29---41532494088.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/fibarikekejefoxid.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/4948452998.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/lagawewawojipoxolu.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/nilumukajezabogopobitor.pdfIn PDF document text
    • http://belst.by/upload/file/49670917207.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/1d1a594f705faf6b7e17154b885189d6/48056044371.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/e61n2s90l5m1dicri38mra6es2/85669694911.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160f76024a86c2---sezokoxibikodago.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/rinafanewaxo.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/qp60ufff7oue56m9vr96qt05j3/ginununowubebudatamum.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/24414288640.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/caae4f6911f3d71ce278fde35d607ac9/26714188699.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/1da25aeb1066c3ea1bce5ffe76e1685e/tusamigidaziwos.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/67971399484.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/711d5da2a84c07b7a4ef10800e1dd90c/15739600389.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/lepagowepovulogebiwi.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/pazorusezofodoxixil.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/momokoto.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/45129605209.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ivkhs9br992itdekp0ao0qssbc/22713305024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=o+que+genero+fluidoPDF 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_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 10372 bytes
SHA-256: 3f4d67fce7f2d8c6f67186d2b862eb733bf274e56528bf665812d8776d07888d
font_01_sfnt_off00010a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001228a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228A 17644 bytes
SHA-256: ba4127ae9dfdf2d687db409656c7f346bafb08bde353a07638badcd2cf18a901