Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb75562ce25cd7e0…

MALICIOUS

PDF

78.3 KB Created: 2021-08-25 18:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0dc264e94eda22a30e054d0f02284df9 SHA-1: 986a737f48964aefaa9424037598ce33d2c9414f SHA-256: fb75562ce25cd7e09661af4804fbd8c15177cac02695cfb8e0565f822e1447b8
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://wastran.ru/uplcv?utm_term=finance+internship+questions+and+answers PDF link annotation
    • http://guidesdugrandlarge.fr/images/import/file/25179052955.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfbca60262c---vukutenagel.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/99879677492.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/mavadavuxemujini.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/pisalopasepufano.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/lepagudunetapusikomajire.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/82220831627.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/bulabomikelezelunan.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/1921545693.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/71737428410.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/33qu35l65ial61840cqfsqoq27/weger.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/zominitofonipemukisu.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/sodejavudojetegarixuneru.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608385fa76352---firidujasinakag.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/65cd7db79e02bc838088da3d6313aeb1/lebewivototit.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/9271376323.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1a4191a91---jadomovapixa.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4e686f2587dddb906fe848dea7434416/nesanilalekimazepuxinob.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210713_1813813FE9F7F727.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/17720342826.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/5g8bc4iasif8ruicmgkbj539o2/banapetejexapa.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_off0000ce8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8C 17072 bytes
SHA-256: c275ac149bca7a888bd6b123235a8876221abd1a7c6d48e930a37e212744802c
font_01_sfnt_off0000faf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF3 10876 bytes
SHA-256: 6a1e72f9e6573cb559d21f58e7c640ea3220dde7c2f893d9ee01ab6e0bb7cda9
font_02_sfnt_off000113dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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