Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44af191178dd13d…

MALICIOUS

PDF

78.8 KB Created: 2021-09-16 10:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9851a2c8c3a80774fc2f94f76797e5be SHA-1: 0acfb36847047f172ad2b9340c40a0c8bab63c22 SHA-256: d44af191178dd13daae657fa110f25ced38fc1b85d302d1fc1599478616eb76c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://chcial.ru/uplcv?utm_term=structure+and+reactivity+in+organic+chemistry+pdf PDF link annotation
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/voxoxamuposalawemefebuve.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/leserowikokusirexigu.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161406557001ff---93487274863.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57356886674.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137632b135cb---38605683256.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/90131100644.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/muwebobavizoxitadodul.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/todifotixamo.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/bonavotoluduferufif.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/negujajeretugatiridaku.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/45843454331.pdfIn PDF document text
    • http://myslizdrave.com/soubory/73843634193.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/xudazenupiwutog.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cafe2b73a9---lufesuwu.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/94688271870.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/fapolug.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/49946146717.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/bugaduse.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/261233445d26a38d3f6032b4bc480987/87966988639.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/90144811939.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/56769591385.pdfIn PDF document text
    • http://www.puhito.hu/uploads/devine.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/84976398056.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_off0000cbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE8 17980 bytes
SHA-256: 243ba5f1670bce3894108d59cae932fc86417bb3ea003d5dc9b21e1f91d4c604
font_01_sfnt_off0000fb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0A 11376 bytes
SHA-256: 435dd590e4a5d7a90878390822c5bb9344d809605afe01b170a5d6e0be20be91
font_02_sfnt_off0001157b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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