Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2ca23b1d383a33…

MALICIOUS

PDF

84.0 KB Created: 2021-09-14 02:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b238cea4d6c2b1879c4c36b6b8af1b12 SHA-1: f632ad6eb471d3e6da3428fd12b5cedc2c206f94 SHA-256: 8d2ca23b1d383a33a60016e8c527bfcc79fac9345797c3a47a92d1986315ec8c
164 Risk Score

Malware Insights

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

The PDF 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 hosted on compromised CMS uploads and disposable hosting, designed to redirect users to other PDF files. The presence of a 'download button' lure further supports a phishing or social engineering attack pattern. No scripts were extracted, but the overall structure suggests a phishing attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ceramicaartisticamarsalese.it/userfiles/files/9645849388.pdf In PDF document text
    • http://ocean-ex.com/images/blog/file/kenuguvuzem.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613787260e11b---lezimudanunadexotuzewow.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/nimewa.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c22b340b1---23833166130.pdfIn PDF document text
    • https://onlinendttraining.com/files/sederawatorisorixunesiwaf.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/ropoxomojunujuzizavimo.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/34958901871.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/86999671958.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/muwixoloji.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/43243111990.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/seketozuvunadagat.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd1516fa91---5100664987.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/80670426191.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/tibotejopupopudosunoroxi.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/17475101303.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/rupominuvilebajedarexukep.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/51015636776.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/pamaxenibeko.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/rexitalilonosir.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/wizalefidasaxu.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/janubipejasoguzigutap.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/bavalewusuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=codm+garena+latest+apkPDF 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_off0000defe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFE 10768 bytes
SHA-256: 0a1df9e5e85db8f54919773b0fa8738f883d6952918416d603a3e33918c8be88
font_01_sfnt_off0000f796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA8 19332 bytes
SHA-256: bf029b072c7f00a46028e690ec6b006c56fdd3fb511afe4ef798412f1da19644

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