Malicious PDF — malware analysis report

Static analysis result for SHA-256 21420b397ff805bf…

MALICIOUS

PDF

73.0 KB Created: 2021-09-15 19:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bdd7796d9f2e25c85e85870f39bf90ce SHA-1: 70e69f08e7e99060febad7d177961efa1e189480 SHA-256: 21420b397ff805bf1366fde77dc1534b4718a73b03c8c64a6b6966c01d1f67e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of a URL with a 'talking tom hero dash hack mod apk download' term suggests a lure for potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crysiq.ru/uplcv?utm_term=talking+tom+hero+dash+hack+mod+apk+download PDF link annotation
    • http://elsekmont.eu/userfiles/file/fejivufo.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/32168257117.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/10913688267.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161388a7d16367---zexebafenorazekujopawajo.pdfIn PDF document text
    • http://www.puhito.hu/uploads/pibeziv.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/32994397198.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/54417083576.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/gawamonanezujuda.pdfIn PDF document text
    • http://vuason.vn/upload/files/7114238432.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/39221932891.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/nitogedetexiwobudir.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/sunukanoduzumuxaw.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/narotudowogowali.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdfcd66a49---guvaluxilen.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/97861766883.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161339bcc8dadb---62337109201.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/9267740445.pdfIn PDF document text
    • http://exima.kr/userData/board/file/sigulonekuxapokefelegi.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/lodofu.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdb163ee57---3652640586.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/42080323419.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/89309966239.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_off0000ba22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD234 16596 bytes
SHA-256: b849e97ca6c7bb462386030708d4a7d7de341902ae795e72287c934d7e0ccdba
font_02_sfnt_off0000fc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC42 11104 bytes
SHA-256: 8ded899d428f97de213b51c4167138404bb7d46da7d200fb2355887e303a650f