Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ae1ab5e7761c34…

MALICIOUS

PDF

70.7 KB Created: 2021-09-18 01:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8e2bae1c36c4f5e1cfee01a62de80f48 SHA-1: 1c5450e82042cbcad0bf5b77fa13a05ded11cde7 SHA-256: 44ae1ab5e7761c34b3a8a37034108dd8053bcc9fe5d355ad6f5245ac405fb21d
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be redirecting users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cructi.ru/uplcv?utm_term=word+to+pdf+for+windows PDF link annotation
    • http://maekalocal.com/Maeka/UserFiles/File/46665607130.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/fisarumilituloxoluwuvazin.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-09/images/files/3869779669.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/raxaxewitizixam.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cf63329a7---84791579505.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca210f388e---jaxaritif.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/75l44bo4rh9lglonsp9pcupqa0/durasodabix.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/fd3bf6523e497a9d07c63daa48a3ca1c/99858010346.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/sadotexe.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161443b998849c---kitipebazesugelazu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161411e2fcc6c3---32909651376.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/lemifuwiroburuke.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ti0pkvn02cvht5n8k9te96mmd3/vitakutusafire.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/lebusanotesodisimitewowe.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3b1e4ca7---solimanalolaw.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109042351599263.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/jixojezom.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/tivopuzu.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090403193669.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/saximowafaruzisoremufogod.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/zivagevafesapegobivepofab.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614511ab55bde---fijakulimojikimiloxewezo.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/felawebakejofax.pdfIn PDF document text
    • 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_off0000b592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA4 15752 bytes
SHA-256: eccec910b15cc3ea29b616e7b4bb7b5fc4bbb9ab79829dc6d53afcc8f4d9333b
font_02_sfnt_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 10228 bytes
SHA-256: 843c357ba4df8f674ba1e0a96593296cd1b386184c5a1f74f433928fcbcf104d

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