Malicious PDF — malware analysis report

Static analysis result for SHA-256 62be20ab7f7ec6ab…

MALICIOUS

PDF

71.9 KB Created: 2021-09-30 19:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 5730b3e1f2e696f18dd454025e137e55 SHA-1: f35aa2ccb79c27483493dfee8797c5c6ae9a14d8 SHA-256: 62be20ab7f7ec6ab44e19f4493775f53e726e108c5006126227203f2b27c5837
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://gemaeldeundobjekte.de/uploads/files/48230768555.pdf In PDF document text
    • http://titusauto.hu/kepek/file/28979779726.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/65972074480.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/281605083.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/87291219448.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/gebogodej.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/10097081853.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/84165442856.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/35324760830.pdfIn PDF document text
    • http://hiniceshine.com/upload/kevemivaromexow.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/94515663975.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/meteboxazofu.pdfIn PDF document text
    • https://sitarasign.ir/data/file/sifadidi.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/s0jnclbgnr5ldsbkjgetahu6i9/76161943475.pdfIn PDF document text
    • http://health-bridge.in/upload/file/16579374962.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210930_165356.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/2277814713.pdfIn PDF document text
    • https://venus-forever.com/image/files/menujubefuja.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/2d855c5f94258e5963138d8ec92ad729/wexujipeworijabijevup.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/wezidasaxibogujo.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210904054914.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/lawebavevej.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137e30943f3a---kidululewutagoguwigep.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/pedifefifakivuwejewor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=fortnite+apk+for+chromebookPDF 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_off0000b319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB319 17512 bytes
SHA-256: 7d4686d690db5b69d338a84ffd2a196cc391287e9cc3a8df70609a61b73edef8
font_01_sfnt_off0000e062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 10740 bytes
SHA-256: 8ab2046fcfa7c71a682f8834a7f221ddc76662a743d42de5d8589b200c081d2b