Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c72742e43b4307…

MALICIOUS

PDF

78.0 KB Created: 2021-09-23 02:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 778c33e63390af1b86cfd2de91356f16 SHA-1: d4d07a75d805dae04821c2f33434505eabc8072d SHA-256: d7c72742e43b4307563e905d31ffad5d5f1ecb59b6db6f91107d5e17b8bb569d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a large number of external links, many hosted on compromised CMS uploads or disposable domains, strongly indicates a phishing or malicious redirection campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The embedded JavaScript likely facilitates malicious actions, such as downloading further payloads or redirecting the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 7

  • 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.
  • 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 https://coretry.ru/uplcv?utm_term=modals+worksheet+with+answer+key PDF link annotation
    • http://chinhlytailieuluutru.com/media/ftp/file/40907524319.pdfIn PDF document text
    • http://underbutter.cz/download/foto/zataranifeniwuwilu.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/18524281245.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/67528248851.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/14384146990.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/85133823427.pdfIn PDF document text
    • http://weshare.vn/attachment/files/87202346943.pdfIn PDF document text
    • https://limsurdua.com/contents/files/xoxiwuvuvikabugesawolojij.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/21267436247.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/89747571318.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136441ab5e41---77325711227.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/jaziladepi.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/6496915182.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/tuvafeboxepugak.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/90192003645.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210922010014.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/madipejozu.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/ruvikubedewilozon.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/32188210548.pdfIn PDF document text
    • http://cga82.com/admin/File/tazifawo.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/kuwoziwufa.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/kudilodusosafisoweki.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109191624133601.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/43ca4151e5858ad50807a11bc2a3ceee/jotupisewupuwikuxes.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/koretuda.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdaa21448e---fedajewatogawawugof.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/89547977370.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_off0000cad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD0 17732 bytes
SHA-256: 5584392a81d2b74a1edef574e2cc076140340325dc23bbcf09689efa7baad3dd
font_01_sfnt_off0000f948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF948 10628 bytes
SHA-256: d27b3fefd95618a6f7596c47c276fe4bed7422c9d65ca1df8f241abf743b90ae
font_02_sfnt_off0001119d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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