Malicious PDF — malware analysis report

Static analysis result for SHA-256 da20287720304526…

MALICIOUS

PDF

77.1 KB Created: 2021-09-04 06:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec5e348486da2b228085517b079065b3 SHA-1: 0b3280369a38faf61cccdaf189398e86c52ba18c SHA-256: da20287720304526859c7ec17040e5595e3561fa3109aba5511bc5bbbb8c669a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The PDF's structure and embedded links suggest it is designed to lure users to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/bd0a3fa93256ac719d541dfd229d6a77/vijixipovazezofidal.pdf In PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210728_000605.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/52450532317.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/kakidon.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/92508787245.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/97463970562.pdfIn PDF document text
    • https://euchebnici.com/img/file/nofakulomupovobude.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c8596680d---84469468058.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/bunemuse.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/ba6d2c0860b555a19fdf99a4c9895930.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7687bab57---64723593702.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/27854691480.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/duvawa.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/dezevapazoju.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/83684091456.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/42cf6f52406548fbb986ab9df1a5c98f/3071924156.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/26201401857.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/28b2929be0b10b548ecc4f7b9333bca4/29245701964.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/37958137797.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/s30gk4f59nr32pmsaht4mlieme/71519522705.pdfIn PDF document text
    • https://nevisnews.com/userfiles/toribokezo.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/terc5u4f588jfpnoe30hhs0506/85415582798.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/11df087281ec72f46f681c1923a9ab2c/93539602649.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/nerojigawuviwuresusos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=jurnal+glomerulonefritis+akut+pdfPDF 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_off0000c805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC805 17312 bytes
SHA-256: 33fc70676c62319151cd3411703a9ade153e74f1b04b46475721a61502c6bfb1
font_01_sfnt_off0000f4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 11024 bytes
SHA-256: d8303e943239decec52a104ea329745143f10f8e3d3eae2601b1b19eb5bfe566

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