Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd15d33bcc7a6bc4…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 04:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4be3d6dbfbb89a183d74ae2e50edf36 SHA-1: d04fb74f29609793826e1060cc8597611bee405a SHA-256: bd15d33bcc7a6bc4d2d5b74f919612fdce3458fda637a9972949710a59cd4d76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content, likely to steal credentials or deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://medvor.ru/uplcv?utm_term=pirates+of+the+caribbean+solo+guitar+pdf PDF link annotation
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076e45e7ed47---bapeboxeroxofomefuj.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/bubejeke.pdfIn PDF document text
    • http://medicentrumbs.sk/spravca/ckfinder/userfiles/files/nowokibesenoko.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/2955656150.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/61996914766.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/40134188313.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/lujebagalonafow.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/mutokurimefulunefipavi.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/98589792087.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/6021833493.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/08/13/48003771809.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/xovasa.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3563f2571---23858317027.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/pesow.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/73384021529.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/e559aea3e38e34a654b3017863edc133/gawiwima.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/539e74da21bd4599966f06dcf978fe14/xavewinaderi.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/139837165.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/xorivumupanileridezesisu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920fd9d92d0---35037494869.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/nulodezoxolubarizebidakol.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/7b5a8e58547b1e0e44488e3fe9c968bd/13966050816.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/niroliz.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_off0000dbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE7 18552 bytes
SHA-256: 7e0688b0f5d1ecf057a0b611e6285736c9df605cd72d46ca4a9b277a6dd48634
font_01_sfnt_off00010cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC3 11140 bytes
SHA-256: b0ef16e52b4704b045dc51aef2cf08fd84594f710411f3a5cd47c4d3b3ae99ab
font_02_sfnt_off0001264c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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