Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a4896a8b135ac3…

MALICIOUS

PDF

136.3 KB Created: 2021-09-08 05:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d456e87be68da25ac954104b56ca06aa SHA-1: 1a76c4a2062d4a46953f115228c2766f707a5653 SHA-256: 87a4896a8b135ac38c15a8e1e2cf9206f4bd89fb7eb5319506c663d6df5b1490
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious payloads. Heuristics indicate it's a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to obscure the true source of the payload. The 'Password-protected archive handoff' heuristic strongly suggests the PDF itself is a lure, providing instructions or a password to decrypt a subsequent malicious archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bjsteelvietnam.com/upload/fck/file/tonekizuweliwunez.pdf In PDF document text
    • http://utuin.net/files/fckeditor/file/wozimajukazuwabasipitode.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/gapivesitixes.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/5c2cf28a2b2e5101b9fda87f9f4b1eb4/15876098517.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609126b0d9b8e---96524011878.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/45888594164.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b64eaa753---50796891525.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0ba68705a---tudokese.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/rezeguwut.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/243420e96787c9fe60c1c9d1254a45d2/82342838297.pdfIn PDF document text
    • http://adveotec.com/img/file/43105083699.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/dukusapifune.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612e482c300e0---72038512033.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/16593530426.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/nenabaf.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/rowuvetowosidaku.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91b59bc06---38242192103.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/65184308920.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/69216649607.pdfIn PDF document text
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/47510579782.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc28e9a02---tosatorevarofom.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/p8kgvmm4cas59ld0lrp8752hu2/jupawu.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/77248804118.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b6d2a0149700584fb949c4c5a81d957a/912231733.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/89832496514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=perfusor+secura+ft+manualPDF 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_off0001af86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C79D 10504 bytes
SHA-256: c0bfba7c974f80b38d3e26b9b28d73469cd77ad3d4840b051bb4f98aacd8a7ce
font_02_sfnt_off0001df91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF91 19804 bytes
SHA-256: e507bad2e0bb1257d1db479b729794f7e6bb08527404563f5297613940e88573

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