Malicious PDF — malware analysis report

Static analysis result for SHA-256 513ef407d3c78de6…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 21:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fff6ff1c6cc4c7d71bec07d1061d5bd6 SHA-1: 22e547ffd7667901bde3fa02e27d95aabfbcf06c SHA-256: 513ef407d3c78de6ad21155745c2db572dd1d15da1f3278ead4f64f0419f5efd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host a large number of links, likely to direct users to malicious sites. No scripts were extracted, but the presence of numerous external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://catamma.ru/uplcv?utm_term=biggest+weakness+interview+answer PDF link annotation
    • http://aqcons.vn/upload/files/85278343859.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/86012523059.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/wuwiji.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/vavezatulabotula.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/769a0c0d632259df079680f84c9c51e0/63630198340.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/zajikijugapiv.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/66813979934.pdfIn PDF document text
    • http://brukbet.com/user_images/file/dapesibelolirufadijar.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7da625d64a243965036a4964d5c1f25a/lutatizek.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/sivugesegefigazeraxukapu.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/55901083319.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7a4f457562---86381409109.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/80310443209.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/63301683937.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/lqq0m7p010nurdvj4tmoh1nkjt/xiwurixit.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/q1m11id869hsf73p5pubibc0n3/84692764480.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/c5e6fea95099cdf84f0f5dbaed79833e/91672593610.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb4c0241b39a914ccfc9ddfeb305798d/99893913095.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/da0dfb27fd28a397f8451780428096d5/kigivafosov.pdfIn PDF document text
    • http://badgerhillfarm.uk/laduragigewolozomop.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202108160803028562.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/jupixar.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/23782935952.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_off0000e470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 17488 bytes
SHA-256: 22f67b97ae0b39716d50d1efd0e8b61d5cceee51470840c1ed70ca12c77de46b
font_01_sfnt_off000111a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A4 10416 bytes
SHA-256: f4a8a95dc9db8246f0b62839a46239becf5100a16165d0d43b1734c05128b0de
font_02_sfnt_off0001297d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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