Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7aedf0f2a38850…

MALICIOUS

PDF

88.0 KB Created: 2021-09-11 08:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b3a4d905af46c384f0925f2e2ccb6860 SHA-1: 685f88429e4334e5cd844b34202c0626c1c5229f SHA-256: ba7aedf0f2a3885081df562f64b3f511b525f86881774748b5e620e4d77b69e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://rasathantrananotech.com/ckfinder/userfiles/files/34470860538.pdf In PDF document text
    • https://fond.ru/userfiles/file/39636185683.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/kigawudixuzina.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/6994621677.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/luzonupod.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137572cde848---satejelamivud.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/fifelugodezesilob.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/16610816684.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210907205358.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/71146074705.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/zegesenufafutupekuz.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109110218033434.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/84408933229.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/zunaz.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/19268113948.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/megexexinefanogogurabozu.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613bec821e18a---lapajuza.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/fefawaz.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/sasokizizirizinibujunenet.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/38314780880.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/bitemawil.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/zidiximodegopur.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/82180940431.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/bdc6e687e524143cac143dff0be5b455/33644622611.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/57622640403.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/56259193590.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/58922253574.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/73167846228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=lecteur+d+application+android+pour+pcPDF 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_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 19600 bytes
SHA-256: 7481460fc1f35c73b198c6d97ef99c610e2335dd1ade735c980acc193fac38a1
font_01_sfnt_off000121ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EC 10396 bytes
SHA-256: fa1069dcc445d9d3674fae88f08068313def9103edc5e88f0c6008e569c6b62c
font_02_sfnt_off00013983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1