Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c35fef644a22b0…

MALICIOUS

PDF

70.6 KB Created: 2021-09-04 01:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3443ab1154c4bd0231134cd31113e597 SHA-1: f3fea61c7c60b4f4f85e6efdf446dd895522ee2b SHA-256: 54c35fef644a22b0bc007e4591de0266d4533ae120f847e4bac1d522712411d5
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, including compromised WordPress sites and potentially disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it may exploit PDF vulnerabilities or serve as a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://bmw-zona.ru/uploads/file/mamexakikugekuv.pdf In PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/ebf90b1da85a949f7302a4cc358ca37a/zonebusazira.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/4a4b139d3103c16dba2097e0f1941574/89038137501.pdfIn PDF document text
    • http://sayarbobinaj.com/file/69085645765.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/netokilujiresanobovetabup.pdfIn PDF document text
    • https://wittnebel.dk/file/35174804063.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/93967466377.pdfIn PDF document text
    • http://domainecomps.com/documents/files/tasopatagejizutosemusaz.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/koleluw.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/4f55602d6208b93f9032574dc0e566c9/falatato.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa278afa63---relavaputasavuzuvum.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/25298139710.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/10627717648.pdfIn PDF document text
    • http://adainst.com/uploade/files/20210630042244.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/gelakivivarukipofu.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/37235384503.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/26241ebe5a2216e979305dfe1b62be0a/26161805439.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/22493472908.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/xigavifuxuba.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079e6a4d93d8---novozewu.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nobubelapiwopawosirasu.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609421cb02176---76574594529.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/33220075051.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160be0217345e4---31004361593.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/bomagugavo.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/20611388581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=slovene+language+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_off0000b823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD035 14696 bytes
SHA-256: e95f364508c4637bd6b829b1ad71d3a6a5c43de36fdbad1364bdf214f781a594
font_02_sfnt_off0000f4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 10456 bytes
SHA-256: 67f162e0aa6241dde32ffa417b66358c98568d5dfbd06ceb5b70241c1b024ea8

Open this report in the interactive analyzer, or submit your own file for analysis.