Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d25ceb112ac8a15…

MALICIOUS

PDF

71.3 KB Created: 2021-09-10 23:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bfc6be51f64a0fd1ad90050135633192 SHA-1: 5a7ef4ca1865c93c19409b239addd5f50409bc20 SHA-256: 4d25ceb112ac8a154dbf51c3785f5552b88d75f90e7c91ef3bf7d9f188993f06
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads, suggesting a phishing or SEO manipulation scheme. The presence of external URIs and the nature of the link farm indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nguyenthelong.net/userfiles/files/38935517347.pdf In PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/zarelutijavem.pdfIn PDF document text
    • https://steammining.com/userfiles/file/pozosodexozewu.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/rarukulurizoragubal.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/bopux.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/vewodavoperezesun.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/xexebatazenolomidi.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/57296505804.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/45699215805.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364d1dae416---zuluxofefopejodutozebes.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/vojogafupirakewapuwe.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/9f59e4596c6cc294e3ff0613e6f5be30/68319300474.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2f940ed39---81715040908.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16135df6ce0529---rupakiguwurikakamifobisob.pdfIn PDF document text
    • https://areicon.com/images/file/tasexuwu.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/zazubuzatezod.pdfIn PDF document text
    • https://flyags.com/editorResources/file///bupapibov.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/lebabuxeramo.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/wonunotugatuxajat.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/3883186307.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/solajebavejotozutur.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/zovogajidasimajadojet.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/xusanikaxaxokefoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=apk+mod+idle+miner+tycoonPDF 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_off0000b90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90A 15272 bytes
SHA-256: bb1ce47ce512a1b2635ed4a862ad954c2f94508847ffc4d1159e6c33d3a0c003
font_01_sfnt_off0000dfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA6 10532 bytes
SHA-256: 04ee6643831681f66eeb444254cb2824b3000fe2f6beb4a274b15ce29ac18c6b
font_02_sfnt_off0000f7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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