Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e6ed950d8284054…

MALICIOUS

PDF

85.0 KB Created: 2021-09-13 16:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a1600d1244dd3a8f814026637e38911a SHA-1: dbf8bc67376714b92aef673f67e2da7ed5cbd90c SHA-256: 2e6ed950d8284054e10e1c9faf8340358b827f3a115f203fd5725ff16fb455dd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not appear to be directly executable, but their presence on compromised sites is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://tochuchoinghi.org/files/39423935593.pdf In PDF document text
    • http://songhakbbq.com/uploads/files/47016293672.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/84061836600.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/bilerebaj.pdfIn PDF document text
    • https://kueapem.com/contents/files/94090491783.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/ginigi.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/vulasitidukonoguj.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/94029161283.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/jeravaginavemex.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///rewere.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/seminib.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///nexemaziw.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/taziforipikefeposuwupex.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/lc3pelb1864qa68fdteom86e50/25791766655.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/viluzepenonilerijofolura.pdfIn PDF document text
    • http://machulski.com/public/file/41071744172.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/78387341264.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/47797504733.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/zojezuj.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/kumarowedokugupodojenosu.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161379b463c789---44125691933.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137675fcde54---18260719477.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/5a2dc78432f165033afb7b4be28a1418/73920636785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=android+ios+pcPDF 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_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B1 10048 bytes
SHA-256: 6597c84495a7d0ac8eaa35c464b5f6ff9a130b9f9c3dd015629667ba0174abd6
font_02_sfnt_off00011712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11712 18460 bytes
SHA-256: 6a230739dec6d88a5f256fcb1536c0fe6a956b52250da7ab0d7ed51bb5c3e7cb

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