Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4ecff85f75f377…

MALICIOUS

PDF

79.1 KB Created: 2021-10-08 04:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 806083a858b3c966da58d70fd613783b SHA-1: 682ee7dfd7204846f8520ca3bea9ffe1c40a247e SHA-256: 8c4ecff85f75f377022610c08457f3cb394066964dfeecb720c3d9c410fe3fcc
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised WordPress sites. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further compromise or phishing. The link farm structure, with multiple links to disposable or compromised hosting, reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://agrocare.ro/ckfinder/userfiles/files/61633770753.pdf In PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614e93d686e20---97786022317.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/43352570891.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/32882915412.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/6903cf626c6f5adfe2090123ea88a9c6/xogajisojujusuviwodej.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/vajowitixapuregutat.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/77895314028.pdfIn PDF document text
    • https://svltv.in/userfiles/files/61286836262.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/77477508867.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/79513111267.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/goperigatugub.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134e613e8468---88871553365.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/jujagegev.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/10534422595.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/nosoveparimagupobelufa.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/dizusolutiganiwolazofabuz.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/bosetatufifuveretuvugevi.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/dejibeliribelanurumibe.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/30484363531.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/11231715093.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/tukowa.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/pipoma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=cbse+class+12+commerce+previous+year+question+papers+with+solutions+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_off0000ca16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA16 11740 bytes
SHA-256: e2057137a078a3450e1301cc90b0139c75301ae0c0f947d2f4f5b1ac1ba033a7
font_01_sfnt_off0000e5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A0 19000 bytes
SHA-256: 9f913a0b549a0be872652fd150f0e839b98baf197afe8a0568e8acff6d2eef75
font_02_sfnt_off00011660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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