Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b58e6994bb58fdd…

MALICIOUS

PDF

71.7 KB Created: 2021-09-03 07:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c21b6b75a4c08e3fb16c8fa73a7e6726 SHA-1: ecab776263a0a23075b492385d071d95759b3c24 SHA-256: 6b58e6994bb58fddb15d20fa583a9e4e12c4077d0b6cea7e5bf1af09972fd19e
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to compromised CMS upload directories, indicating a phishing or SEO poisoning attempt. ClamAV detection and ML classification strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.scilights.com/wp-content/plugins/super-forms/uploads/php/files/3fcf1b73f0c89bac13fddd7be40a0741/vokipaxavulubodepa.pdf In PDF document text
    • http://ekotronic.eu/files/file/82787201022.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/nalivewirukekupameferu.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/20918737476.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/2c1aac340d137f65c21835018507c220/dozetamizi.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/se05evgjb7tcd3scu5oe8srsg0/81973040711.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/bccaf61a7f8f18b338c729d61653d1d0/10436571637.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/df2ettr81d8ql8hvdl3ci03h63/94284591459.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dcbc39e18c---bokiwofopaxobalefiloteg.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607166573a5a7---lisogu.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/79680666778.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/9eed7cb8b2c4cd4b5206b15801f2b364/27588071347.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/labufopudinidusabobekutem.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/5259dcb1e35c3d460a80b27be8caed11/6001938318.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16115bd3b11acf---15048753776.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/vifidiliwuvipukome.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6622e7c21---runugovuxaro.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/5cc80092233bd21af97f6fb85ef0e34b/dusubapofu.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/51877821027.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/40371099519.pdfIn PDF document text
    • https://ptogel2.com/contents//files/gewubonubokap.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/d0030ae043aaa1a19db217ea51fa9c9f/52369163832.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccbaa3e72fb---suvafujajiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=habronemosis+equina+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_off0000b89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89C 10892 bytes
SHA-256: 2ce268758a4e3e924075fd08788227bb94fcedbad112dd344b1bf4a5c12db1fe
font_01_sfnt_off0000d146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD146 15836 bytes
SHA-256: 84ccb821f502cd6eeb8fe485fcfcbf82572d6d96800df0cb30ba281c6192cf47
font_02_sfnt_off0000f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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