Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e380661aeba8aee…

MALICIOUS

PDF

76.5 KB Created: 2021-09-21 08:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 47997573d153457f022481105b1eabfb SHA-1: 00a0c32ce53527365efaea5aa4c436bed046b7d4 SHA-256: 3e380661aeba8aee83a690d823ee2a4b7ef41780b72f45f02296716495fb9f86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm intended to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://aktien-analyse.de/images/File/19970423720.pdf In PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/vexoxubudizujepug.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/nojumivifojagil.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ec25caf36---54178988193.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/pupodezalolexonapofotelit.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/rumupuredesinifisub.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/30056072442.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/ronimaxiwererareguv.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/24437281158.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/burudemafirowagowafurit.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210905163548.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/xilizafuravolifuzafej.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/49973285412.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/22077839352.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/052461cb3a6ae87a8068b789914c465b/71411764665.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/waziliwexadoleratilis.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/gudifoxiterev.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a971ece5---29390848585.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/q95qj23ss97n6986gg1c9uqj0h/81550230278.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/5332563851.pdfIn PDF document text
    • http://sushibelovo.ru/files/54242298745.pdfIn PDF document text
    • https://temahr.hr/files/kapotufididalusinikefuxi.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/40350883600.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/pukoropafiwoj.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/tqobll1cr9nsu47j845ffs77m3/72479720827.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/29175578294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=fraction+calculator+websitePDF link annotation
    • 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_off0000c838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC838 10528 bytes
SHA-256: 0df5e515b55227b697dce795928380abe2e553e87f7679e4a48395645d9300d1
font_01_sfnt_off0000e066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE066 17072 bytes
SHA-256: 512e582c328507d75765ec6f8dc6337fc6513c3c018f95855fc205f47af5f119
font_02_sfnt_off00010ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1