Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce0b00fccd16583a…

MALICIOUS

PDF

88.3 KB Created: 2021-09-07 00:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 258d912fab2ded231e44d0a6ffceb366 SHA-1: 877e2df00dec7075dfa0c5533b2cf3ab6b621e28 SHA-256: ce0b00fccd16583ac639d6431cf27467c3b42f163e77f2fb1679ba43840b4247
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • 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://vozilasavozacem.rs/files/78389209335.pdf In PDF document text
    • https://vresponse.net/userfiles/file/12312837308.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/40127692245.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4364f45513---96522870215.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607617125af5a---wofuxumukoxole.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/zezuliwijovoxa.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/d402cdc272ff7e4b2dd70780fd187fab/17813619589.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/mavagixonoza.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f1815ab7d---juvibiterurosumas.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/pikozezirufijitufuvazugog.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210806030817.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/bdde25dfbd376dfe74e73c17ded85fcb/gopopobuvefogetuw.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210815_26CFCF40D25E1ED9.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/40105188524.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/85244743058.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/fc5484f7507d76dd7cf9ec28b263ecf9/47553094068.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607590c7ce1cd---tivewebugabisujufew.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/bufigisudozi.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a17dce04---65569458715.pdfIn PDF document text
    • http://bmcsteel.com/uploads/baiviet/files/65512073096.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/38893803947.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/93e0cb64466e39072c58abd84443292c/73280594023.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/93102255036.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/pudawutezotu.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/96582502824.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/nebumitutogepole.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160826fc348eda---vijadedivetubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=jpg+bestanden+samenvoegen+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_off0000eee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE2 19996 bytes
SHA-256: 1eef0d9721eb5429b9b4a2aa80bb161600a58b8222c36c2ad586325f1bdca250
font_01_sfnt_off00012217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2E 10892 bytes
SHA-256: 2fd66cd4b1cad0e62b7c3b652816d7e2b16e7d978936e5df9fc5aaedabad6430

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