Malicious PDF — malware analysis report

Static analysis result for SHA-256 728a2621098de03e…

MALICIOUS

PDF

84.1 KB Created: 2021-08-14 01:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ece5a91936bd52c97b1ca7672cc0622f SHA-1: 69826bf4a1708a7d7d9318148f643b4da797f919 SHA-256: 728a2621098de03e6a23e3720d8a45552c4ed79ac2e971e05ed5052b039a95ca
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a phishing lure, specifically by indicating it's a password-protected archive. It contains numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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
  • 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
  • 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://queure.ru/uplcv?utm_term=como+recargar+diamantes+en+free+fire+por+id PDF link annotation
    • http://kientrucsangtrong.com/plus/files/mibakunujevumemi.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/tofopoxosumud.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/82211025805.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f0171fcd14650e5100e8916dbbee5e22/fuwajaf.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/gotim.pdfIn PDF document text
    • http://etnorom.hu/pictures/buzowasimemonuxesutezu.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f672886fc---40515344807.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/58301551100.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/18255763408.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f655e7bd4f3---busefisigilejagidem.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f155435a21e---1001569716.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54cd7c3779---wawutepodomor.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/momurusevibefogezo.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610b0ed05699f---27103415739.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/gadobofididunajuzelo.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/zomufokin.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ce14dbeb97244d3e77e4d0405bb31104/gexizitobotitebirapijota.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/30036033431.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/da15d4195bf6d4e25e863e074d7a173d/17081487842.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/23360887127.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/bg1nvhflvrvbrn523hhtg9riks/nezekozije.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/afbb8c89bdda8e70de4bed5193daa5ea/zefowujegonigokawe.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/272301572185.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c23209d5341---61474051908.pdfIn PDF document text
    • https://dptech.vn/uploads/files/10527141470.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741741950fb---gadunij.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_off0000e2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E3 10948 bytes
SHA-256: 1e64846a4b9c8203236012e4ef2613c04e5e6a5890583af31277c59f8898e400
font_01_sfnt_off0000fc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11426 17908 bytes
SHA-256: 3f4b86d82f49265ec2a83e20d47e6b02426171563213e23c493ebd242ff0c97a

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