Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e2eb34f3fa9b289…

MALICIOUS

PDF

74.8 KB Created: 2021-09-16 15:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d1959ac7f78d588c662dfffce4a16ac2 SHA-1: 77ecd9e84fc28d499483637ca43727f9e9bd6114 SHA-256: 3e2eb34f3fa9b28974e7c0abc60f3e9cc1ecc7dda2285da4662d248e869d41a5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://egokituz.org/files/galeria/files/82973666208.pdf In PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/jewixivewilusudez.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/kejurufuxolur.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/1734648817.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161315086be482---tijigojaxovovabidipepa.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/46095899773.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/30693443580.pdfIn PDF document text
    • https://rais.bg/uploads/file/2978842785.pdfIn PDF document text
    • http://wohntraumgmbh.at/makugelapivupigew.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210908_2BDB32F885D26408.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/93975663677.pdfIn PDF document text
    • http://mobil-tech.com/files/6308836504.pdfIn PDF document text
    • http://zzquansu.cn/d/files/tezuvinaxinerupovuz.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/1cd3a5bea9f3825ed0850a23a6cfab4f/maruxaginaxug.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/pukipad.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/62613630364.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/wawidolinaworemasaxepetel.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161327c57c2ac2---11511237446.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161313625702eb---rimifujulanuvoluna.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/17480234900.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/nujubakamizo.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614192978bec2---xelupakidojazonewip.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/kiwelizofemodolipupaj.pdfIn PDF document text
    • http://hnht-electromagnet.com/d/files/83764604691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=spa+games+frivPDF 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_off0000c164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC164 10472 bytes
SHA-256: 229b4a8318693e2c1f479b0bfdb25c2f599b223c17e18a6b56f71a769119e5be
font_01_sfnt_off0000d935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD935 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF147 17060 bytes
SHA-256: 2717c1cfd1aba15029a145c88ad5de6731ea538d51175a922fd8987af136c41a