Malicious PDF — malware analysis report

Static analysis result for SHA-256 d660e0e7cdd792f2…

MALICIOUS

PDF

84.5 KB Created: 2021-09-23 19:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 69183d88018e0f4fa269ec7b743624fe SHA-1: ed1e9ac599251fbe6064b473d918b8ddbd09ac5c SHA-256: d660e0e7cdd792f207e45f918c5fa704dd4ceee45f1c1bde4e111d83e4efa46f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially malicious or phishing sites. Heuristics indicate the PDF is designed as a link farm on disposable hosting and points to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=how+long+does+cooked+chicken+keep+in+the+refrigerator PDF link annotation
    • http://www.galiantsolutions.com/emailimages/file/12611501488.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/xopeteli.pdfIn PDF document text
    • http://soles2walk.com/data/file/zivivapibewe.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/xasutosatepogubedeputaxo.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/66193607257.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/dexisimopokotuvabavezozem.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/413741069.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/78425809851.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1631813266.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cac062e7eb---52189457130.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/79203324764.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109031905552062.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/67993218965.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/dowupemanasi.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/74782728879.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/jirotabenepubej.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/9e7a21b3bdf0f7e477592d35f940bed5/pubef.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/330253709613ca897f0384.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/30636837433.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/81787091960.pdfIn PDF document text
    • http://surausa.com/uploads/files/62674182692.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/53308640221.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/lawiwematapetukam.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b545c6dd2b---47710970965.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210919135727.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/lijino.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_off0000e60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60B 11068 bytes
SHA-256: f71788df08a9a123553605f3d955cb88c22322027f177c7aa736b0e19d71c2ac
font_01_sfnt_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 17044 bytes
SHA-256: eacbb5cae55185bfba198d8a0ed9808831daaf8805a271b25879da00ed29ca2c
font_02_sfnt_off00012bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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