Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d254c1be9887ad9…

MALICIOUS

PDF

83.9 KB Created: 2021-09-13 09:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b5886b8424d518fc70831b7c0956ddb6 SHA-1: 7a7a41fa158fb516b173a3737d0a84c346ae8e73 SHA-256: 7d254c1be9887ad98fb08331076d5f56dc7686c0c4d79bd320d83b8e2d5380b2
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it impersonates a cloud document lure, aiming to trick users into opening it. Embedded JavaScript streams are present, which are often used to exploit PDF vulnerabilities or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://harmony.im/userfiles/file/65179457476.pdf In PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/fesipovavu.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/zinib.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/40286900000.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/95424297825.pdfIn PDF document text
    • http://topflexsports.com/uploads/70751007524.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613d25bb1580c.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/xuzubilo.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/bapagogurolikamudukowu.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/30043008460.pdfIn PDF document text
    • http://koddous.com/userfiles/file/74916653802.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109120556214577.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a88c2cc657---25500310807.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/zukoleb.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/29933057141.pdfIn PDF document text
    • http://bluebossa.pl/files/file/72165202357.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/lofabugom.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/62677802160.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0f18ae7aa---60835380309.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/24347874612.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/powefex.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/8f5960ba58157368ada07bba85fad42e/ganowop.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/34g4mjjra0liknql4q0hppeltb/96460828254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+add+more+ram+to+android+tabletPDF 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_off0000e4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EF 17804 bytes
SHA-256: c3b88cdf5b368b6bd2994fab65c2277e3eba996e0ff2b2b0f1e839eaca3bdd90
font_01_sfnt_off000112c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADE 10456 bytes
SHA-256: fee61ddc29a13000a9548395de2da7037de006111f387ac11a4c02d31c8ca490

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