Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7af6cef2f3c97e…

MALICIOUS

PDF

96.6 KB Created: 2021-09-08 12:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 237f96e854d7892a77907cd25539ee33 SHA-1: 4e7c0df1dc4bb3997e018a9a1c93434195814c98 SHA-256: 8d7af6cef2f3c97eef80ea1876238edea16171f1f4822c6b2eb93b108ed3beb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised WordPress sites. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://youngdongtec.com/userfiles/file/vunaxedu.pdf In PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/pomibabixalizim.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/8843821133.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/zidopizax.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/tolewijapigoxub.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/mazuxegefatejuvovarile.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/17c73bffbfbfa6281e033d1f1f964a1e/84461468187.pdfIn PDF document text
    • https://magerp.org/upload/files/14986024533.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/84672582775.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/pamavawupimux.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/kogititasatazu.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/mojevekegatebeloneduzod.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137d8a585270---xibup.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/85143807913.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385ebc5d4e5---88660121619.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/n6eotqacf9rmtlhidk8kf4qjh8/xojimi.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/84021985940.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/51942846237.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/42560981548.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/42642462560.pdfIn PDF document text
    • http://fourfoods.com/images/files/87255021717.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/giduvetuzinel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cours+cytologie+pdf+gratuitPDF 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_off00010cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCE 10936 bytes
SHA-256: 4be662108f0bf7f8d76f4b52e83d75a93a464ed2e7903d4634ca42aeed90ba30
font_01_sfnt_off00012631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12631 21704 bytes
SHA-256: 0df52810b7b784be0e99634a8807993de4d2c417ad35b728a779e76229ba0dae
font_02_sfnt_off00015c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1