Malicious PDF — malware analysis report

Static analysis result for SHA-256 33deff0a11ea0946…

MALICIOUS

PDF

85.7 KB Created: 2021-06-29 14:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ddcacea1f61d0ed477b3ee2047b7eb78 SHA-1: 113c049bcd3395e60697d81071ee997ec72c5c31 SHA-256: 33deff0a11ea0946afcc78b38bdadf7a67d473b166bb4ba555eaea330961947a
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary goal is to trick users into revealing sensitive recovery secrets or private keys. While no scripts were directly extracted, the presence of numerous links to potentially compromised or disposable hosting sites suggests a phishing or credential harvesting campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.urbanwaterways.info/files/muzalopo.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9777809f---poxosotipidudir.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f062311d2---88498551348.pdfIn PDF document text
    • https://okna-stv.ru/userfiles/files/petiganojumofake.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/66830892282.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/nekobunabelulegeruze.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/jawusamaxapana.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/33553831329.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/wazunasugiwepusugobiso.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16071a1d409b80---fawosigasur.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/27718845007.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/a0fd0fc6777596ecc6b33432ad4a7968/94851747678.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/2npi7tlkfbq2adet8knfqi6dep/xegefegari.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/694f749d7d569bf7a350d93a0e05999c/21554611776.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/newolutag.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b620ec5d23---76138083784.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16072abbc5cf4a---xufazisonujizenizuxit.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/gafezuvov.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/97f279106ffdd5d20669644082a81ffa/jijareniwuvixipilibosi.pdfIn PDF document text
    • http://schokobrunnen.com/idata/vuvapeniduzisalibajit.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/ad6c36bf9bab2d566534bdb334a3ef01/romifomuxagukuki.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/glrfcbotdhb3en3akvfj0fm1nt/50278898083.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160766d6df4001---48276531933.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/56524788320.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/6a9dad8dcf23f697aa782ff4c5f930b6/nuvofesoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+attach+signature+in+pdfPDF 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_off0000ea81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 17592 bytes
SHA-256: f2c01676f02f39a66b71b4783287cac3f75447dd875813cf4bffa701196a1133
font_01_sfnt_off0001180a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180A 11028 bytes
SHA-256: 4e7ef2012cea95f898187e0b0ba5c230e97de74639ac59a5ae7b06718c98776e
font_02_sfnt_off00013183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1