Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf00be374dfaf9c…

MALICIOUS

PDF

71.3 KB Created: 2021-09-28 13:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d04976024f3a47b7b8a35759e39f2d01 SHA-1: d7654515a3849de97c1b7c15ad482fd066b2d931 SHA-256: daf00be374dfaf9c80aa0d50a51b121e39eec717b7ec962dad7835e54afd429c
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the extensive use of external links suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pixomot.ru/uplcv?utm_term=make+purple+paint PDF link annotation
    • http://sendedianqi.com/upload_fck/file/2021-9-27/20210927050612938686.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/gesasedubipoluvidezen.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/sopuxemazupuged.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2ba012f8487902e4a3f4c96efc9bc18b/76927942141.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/86125231518.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/tiselamenevel.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/28936286226.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/15899809193.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/6113059239.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614603e2d969f---30629819809.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/16415485909.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/selexemi.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/21038841595.pdfIn PDF document text
    • https://kaparatt.com/images/File/75365229597.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/tutojaresuvega.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/zudaremurajokix.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144cd01e90da---xukowidotogejetinaweros.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/zilasevorazulokero.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/73793550516.pdfIn PDF document text
    • https://mu3yc792xh-rl1.com/contents/files/devagodizepenozid.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/9739518185.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3e1bd7bf4---punilikagunedurotil.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_off0000b321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB321 10140 bytes
SHA-256: 7432ae99239ee6a83ab4b6e7b4151d39c6092fa0d884de1d5c7d8ad054cf7eda
font_01_sfnt_off0000c9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EB 18116 bytes
SHA-256: 282d049210a43609d64c2cc1660e74b9ffe6b751afebb86abd4b09992d1b7d83