Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61ec4e84c30b860…

MALICIOUS

PDF

98.8 KB Created: 2021-09-09 06:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bdd674fdb2e0567ded4d2b4c4969d098 SHA-1: fa4cb2994c0a8aac0c5437c7c0dcc0b8413e63ed SHA-256: d61ec4e84c30b860918c3c4c4c97f986fbbfaaa463d95f5526cbae126b1e45f3
264 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1071.001 Web Protocols

The PDF contains multiple heuristics indicating malicious intent, including links to potentially compromised websites and a direct IP address. The presence of lures for password-protected archives and remote support tools, combined with a 'download button' heuristic, strongly suggests a phishing or social engineering attack. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a dropper for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hotelindigha.com/FCKeditor/file/71197180744.pdf In PDF document text
    • http://esistore.lu/userfiles/file/putalemesisorogasolag.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210906134636.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/gajuvusuvim.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109051443554689.pdfIn PDF document text
    • http://briztravel.com/upload/files/96898859859.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/89636018882.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/59792232841.pdfIn PDF document text
    • http://zae.me/datafiles/file/86037473226.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/tulaperimuxawafexeres.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/pepenaw.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/jifuvedenekulufu.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16130ad2c23dca---95505620771.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/99351515494.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/c7bbd593547d0be92966dba8677d9aba/507186365.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/gamugatulefoxova.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/11190709041.pdfIn PDF document text
    • http://origo.ws/userfiles/file/24399907157.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/tuzodugixokazagexidew.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/79742972405.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/37067932180.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/tulapiwapufenimibebizilir.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/06d13a7323fd55df87a6967fc9b8045c/nudilumurosanobogon.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/zijilusulawexudodo.pdfPDF link annotation
    • http://appli-veolia.net/ckfinder/userfiles/files/zojuruvevonomibisopitur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=call+of+duty+modern+warfare+3+reloaded+torrentPDF 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_off000111df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DF 21972 bytes
SHA-256: d542858ebcf93871fd10afd238563469ee28b14c9c74192ec6149d16d9d6c805
font_01_sfnt_off00014be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE3 10756 bytes
SHA-256: 2a096fc2fb832d94cb17b285dc90d51ee6e275bc02c26f2f7647e82268e27733
font_02_sfnt_off000164cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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