Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7510326f02bf74…

MALICIOUS

PDF

80.6 KB Created: 2021-09-12 15:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fb18e4644de801dcefc21c43f0c25217 SHA-1: 667222d82bc7a3326ccfbfd13b91f7a719956726 SHA-256: 9c7510326f02bf742287f9d7b28ca9d9cc80282752c2d5090beaf5e98ec1c752
216 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external sites, many of which appear to be part of link farms hosted on compromised or disposable domains. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary purpose is to trick users into revealing sensitive recovery secrets or private keys.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://drafthe.ru/uplcv?utm_term=dodear+app+for+android PDF link annotation
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090813132880554.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/82508267288.pdfIn PDF document text
    • http://js-space.de/userfiles/file/5258527718.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e39223b54---23821235582.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/3943928943.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/21215217256.pdfIn PDF document text
    • http://iknow.pl/files/file/89079275853.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/noranatafikofifemat.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/tuxevubixadi.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/ratusujojopakoke.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/fefadafezaki.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/1621089926.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/wufafexodepidesamire.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9d44bde5b---14335517332.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/52326748859.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/269287236.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/fetopakiv.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/sodavagikukenazuwupapug.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/30693534014.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/47585460120.pdfIn PDF document text
    • http://goldmustang.ru/files/files/kuwakowiduzovozegasiwig.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/nanuperizedobep.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/65e7b1976c7ad57426747e14268f918a/47060587412.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210903011840.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_off0000d545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5C 10180 bytes
SHA-256: 97ec67168e6cdedaa2eb59dbf4a51f17aa5c38e85438dd63f1c652b808ed03e9
font_02_sfnt_off00010422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10422 18536 bytes
SHA-256: a8516392dd1deef88c3f40f6c6af0db570107e366efeec855494f1ab7040048d

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