Malicious PDF — malware analysis report

Static analysis result for SHA-256 809b7ee7c8dfc5f1…

MALICIOUS

PDF

79.8 KB Created: 2021-08-30 16:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 50f0d43fcc386c68bc3ffd2d80cca648 SHA-1: f6944f9f07438c63f8e00c4e657247b347d7f0e9 SHA-256: 809b7ee7c8dfc5f1afe4a665220eb087c272c848091989bde923a18b272fa28b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. The heuristics indicate the PDF acts as a link farm, pointing to multiple compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fd3d2ae62---tefekinanogopexaxu.pdf In PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/3d7863c8a0bcce80b0f1893824c110f3/madulexusunasa.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/mizamapu.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/xowevadudijajegupigagole.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/namilor.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/bedae3f38268bb981d0acc3ddd5f72df/xekelipul.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/edfb10ca99883785709553b94092a399/91010315494.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/26495076998.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/84716485732.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160850afab0c99---kedoduwapireliz.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f4212f4708fd368d4235585ad4e05842/xodelanojakosazimotewip.pdfIn PDF document text
    • http://dr-temt.ru/images/file/21902045368.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/91823404145.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a82672a44---37659751331.pdfIn PDF document text
    • http://agama-rc.com/upload/files/18563102809.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66ace9d5f6---lojikopuzed.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c87db3f429---tigalevogosopasafinukixux.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fizumevawo.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/36309508576.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607443de59517---7479236185.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c67d15a117b---1116852042.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d7c6ab8df---9698833293.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075ceead69f5---perexobazuzugazabilovum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=gate+papers+download+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_off0000d630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD630 16864 bytes
SHA-256: 9f7c556baf1b78eea045f0b7b7d8305f367a5f79b6260504cf8f74dd96757796
font_01_sfnt_off000101bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D6 10524 bytes
SHA-256: 5d2560b886caf265104432771b376410a183ae32fc2284a0a8fbdc977e2d92fb