Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6c575e8707df42…

MALICIOUS

PDF

76.4 KB Created: 2021-09-12 23:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e3074b604a9aa1ced57883964cb9c157 SHA-1: b5dc05d6d7f0cbed70b0b7163f0f6a7739366f7b SHA-256: eb6c575e8707df42b49acfccd3e02ac6238d36e7e7cd6244c3ce403f16a9b659
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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=standoff+unlimited+money PDF link annotation
    • http://asr-net.ru/uploads/files/vosof.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20219973879269.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/92726587320.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/4211446530.pdfIn PDF document text
    • http://otczenacts.com/media/files/7473786639.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/vagepoluvubanaze.pdfIn PDF document text
    • http://modero.vn/upload/files/vapatos.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ce45f2ffe8ec4f097a5ecd0f121dae62/34685807371.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/43714362882.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://vrzion.com/data/userfiles/files/89319992873.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/gafogavokivifovi.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/8cvhf3eta1qlg8k3cqrlkfvmck/dukew.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/nudefukuseresajawez.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/66720320339.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/gosili.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/besikajilokuza.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/bonipi.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/31173785105.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/77598555264.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/kkd3piac057s28vua99ai9rjkm/61329577983.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/fumaninexukum.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210906093435.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/77591509654.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/wixivekedibinupazulu.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382c1419496---72975862886.pdfIn PDF document text
    • http://orthodoxnews.us/file/95012300853.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_off0000c740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC740 17396 bytes
SHA-256: 6cebda2614c07e63fdbb8d27dae160b7197790013bdc9ecac91e43dc884f94d6
font_01_sfnt_off0000f42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C43 10536 bytes
SHA-256: c924398fab3ff341ed3d9f8c6171c29f159026e0bc601629113a802ed1f85e23

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