Malicious PDF — malware analysis report

Static analysis result for SHA-256 083aca0ff42beac9…

MALICIOUS

PDF

73.3 KB Created: 2021-09-28 23:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a88ce6eb72503eeadd9c12e14b31552a SHA-1: ea936034e6f8933916a0ee5040f57ee4b93649c0 SHA-256: 083aca0ff42beac9fdccb6257f53f9dc4cbcf55bb03d52dbfddfc7e75beb5c28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of multiple external URIs, including links to compromised CMS uploads and link farms on disposable hosting, strongly suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • 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://suprizpin.com/calisma2/files/uploads/jurimuka.pdf In PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1614e06c8ea1a4---42840252684.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/24237131860.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/55612555518.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/76926194518.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/81773742945.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/s5i0pcoeg0o4ar5a0pcdq34u39/2955277804.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130321409bc3---dezomatugutagazole.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/15528702096.pdfIn PDF document text
    • http://zenithmetals.com/files/79711631712.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/letato.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091115062873499.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/sudajizexitozutopojesoz.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/mijazukovekakirasuvasenol.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/marev.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/65885352537.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/11681978598.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091914543373499.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/majukiluwego.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/61979467023.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/86996915221.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/64569914154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=analysis+and+design+of+algorithms+by+padma+reddy+pdf+free+downloadPDF 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_off0000b437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB437 18896 bytes
SHA-256: 025e394813029f7e00b44b605b280cc03a53e4d17572610a4ab8f24acd884779
font_01_sfnt_off0000e549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE549 11264 bytes
SHA-256: dfe7945c3b5b114dcbc7132261b56aaca086bf9a143af5bf99a4077e73d15123
font_02_sfnt_off0000ff2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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