Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ea51c016fae93c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-08 00:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b8e89eac6e4f514231e3fd150d65cabe SHA-1: 717eb430293c5a4494acd29a3d6bcd2668746533 SHA-256: 03ea51c016fae93c00e049020d2ac2482538ee63e9916cc8bf76e1155b207940
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs, some pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of many URLs, including those on potentially compromised infrastructure, strongly supports a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=pdf+creator+gratis+windows+7 PDF link annotation
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/oetms4aj9h5hou1av27815tbs2/mibimugibadi.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/96107558145.pdfIn PDF document text
    • http://dallaslandscapedesign.com/media/files/50574926771.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/95659422831.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c210393ac77---zukibizivaxajebenapusir.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/foduv.pdfIn PDF document text
    • http://voijin.com/userfiles/files/20829236619.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/17882650385.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/zizajepolukekuj.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/70436574763.pdfIn PDF document text
    • http://landpas.pl/upload/file/raneguxafisidobategu.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/96487002304.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160da4627c80ca---folelunutenisoba.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafeef9f7e7---dususerasozok.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/leruvosaxisumaj.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/93616729724.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210902023341_3wywcy.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/lagezasalizitovomabinu.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/fazisilerugefukez.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16094be67873cf---40166631778.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/nubexozaputikidamis.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/16611716241.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/totewomudipizu.pdfIn PDF document text
    • http://teakdeck.pl/files/file/86388439572.pdfIn PDF document text
    • 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_off0000d766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD766 18568 bytes
SHA-256: 8e4ad0038415ad6ae5a535816865bea2e6765c42b967cf981d9fbf4e19ce9a36
font_01_sfnt_off0001076c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F83 10740 bytes
SHA-256: fdc978dc9b58323a42f3c0c3dfde5ee376d4f0e09f0b6a11ecd3e36d27ea7566

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