Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2040bb6fdd82db0…

MALICIOUS

PDF

68.9 KB Created: 2021-09-10 22:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 24db2d095e218a0554f3517f7a564025 SHA-1: dfd92834946198f7b7d5c7e3c408f36d329cb1d2 SHA-256: e2040bb6fdd82db00f1d75e04925e3adab306c81d6bfb316af26246e68494694
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The presence of multiple external URIs, including links to compromised WordPress uploads and a link farm on disposable hosting, suggests an attempt to redirect users to malicious sites or download further payloads. The embedded JavaScript is likely responsible for initiating these actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://phulieumaymacbaoco.com/hinhanh_fckeditor/file/nujonizogige.pdf In PDF document text
    • https://cingenito.ca/upload/editor/file/kamumuruji.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/16714650706.pdfIn PDF document text
    • http://vucert.vn/uploads/files/midozedazenelibalimasufu.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/21329354598.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161387b421dac9---zapibadojowabedape.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/6873095659.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/73075829597.pdfIn PDF document text
    • http://kdekdyjak.cz/data/faxilosinow.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/xexasuburulogefolumoforov.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/dubiwawubar.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/s6da3vn6pnn6lje3t7ivk90v76/relufapexubiku.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b7aaf7116bff5f77472ea3697d3ee354/4184632997.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133192eca51b---fidegawuvotasekose.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/nupovefonaw.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/bijofegutomaten.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/78852547852.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/236e8f0e8bb085b7adbf4f9de15969ca/84379511396.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/27043651272.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/nofibuwutizikemidekut.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/11943974941.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/80879869601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=my+talking+tom+hack+apk+downloadPDF 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_off0000b16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC985 10848 bytes
SHA-256: d08becff8a25dd12913699b2574cf35ba58423d69324e3bd9c6e9c257a0c8eeb
font_02_sfnt_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 14484 bytes
SHA-256: 0b6b15055207620ec2fc8bb4aad0348ae2e1664db87fe895666e225d2f282ca8

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