Malicious PDF — malware analysis report

Static analysis result for SHA-256 78da49735bed6d56…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 16:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28ef98e0a8150cf90a2a305432911a3c SHA-1: e4b13694003548638f762d5806e154f2f69585c6 SHA-256: 78da49735bed6d562a8b3e5b18d1c4b16dd755a31cd1eb7745865ec204bf3f7c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The heuristics reveal it contains embedded JavaScript and acts as a link farm, directing users to multiple compromised websites and disposable hosting. The primary purpose appears to be phishing or malware distribution by luring users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=received+bluetooth+files+windows+10 PDF link annotation
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/65942b2f6026a82eefa771bf6b2be537/23866500638.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/sipiselegadat.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/96116096984.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/91704209186.pdfIn PDF document text
    • https://premium-house.uz/images/file/jovufof.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e1fe9f130---42186741736.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613023ae08d9c---nofavisedesilowifofonid.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/80900547820.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/96683322287.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/94692474152.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/xuwej.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/xuregatusorekuvulazigubak.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/17907782859.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/semisuxevakakaregewis.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/59428847031.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/52355379681.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/savewejavunobotimetavuvaj.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/solipakizoxelojumabefup.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/nasetubemisimapinazaki.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/14667898877.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/lunegejinovawelazabelo.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/36135803933.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_off0000d547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD547 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 17804 bytes
SHA-256: 10df2111a46cdc4b0b5bec7c89e54efa4024922a46fc28f4e55bdbcfc223fc06
font_02_sfnt_off00011b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B05 10924 bytes
SHA-256: ec48b8966906a46457580aac7a6fecef9a74391a3235efec872cf49400cbf3f4

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