Malicious PDF — malware analysis report

Static analysis result for SHA-256 386b398ef65e3aa7…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 01:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 81eadb5e7940230c6e66850603c11c31 SHA-1: d11b524dbc6843de0f6f9ac4666b8f89c0c00c4e SHA-256: 386b398ef65e3aa73ac86e8a80caea4da1f0271babd1bf6bdd85e6c455e3d349
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. These links likely serve as lures to redirect users to phishing sites or download further malicious content.

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 https://coretry.ru/uplcv?utm_term=half+of+a+yellow+sun+pdf PDF link annotation
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18910391707.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/wixil.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403fa6e3389---92493285794.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f41b98416d---gutebixokejofenatojili.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/37605982596.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/wifar.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/65465399774.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f07ca6c612191214500ea9416cfaca3d/suxejudade.pdfIn PDF document text
    • http://batistar.fr/userfiles/file/27214836855.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/25240228448.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/juweruvivoxiromurar.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/1242446070.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630900492_1.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/afac25262d15775fde779e2ef61ad53e/xotomagiwikulomeredex.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/vitojurixovuzak.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/40242770904.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/44734061217.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351e222df4c---2928120703.pdfIn PDF document text
    • https://ismart99.net/upload/files/dapipubolexivomumevu.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/62504514024.pdfIn PDF document text
    • https://seikai.jp/free_images/files/26778453572.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/70247995105.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/videsoseturalitip.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_off0000dd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD31 18492 bytes
SHA-256: 6340f20796925bc63d4a56bb8c74115d609bc6e6453fd69044fc10a8ab5e6f63
font_01_sfnt_off00010d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D36 10492 bytes
SHA-256: 8a17589d77e4a91e34e87da906b1b478f3b0aea62466cf4b02a5db76c176f974
font_02_sfnt_off0001253e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1