Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70f24383ea2cb4a…

MALICIOUS

PDF

92.9 KB Created: 2021-07-08 08:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a65d839ffb0b62d0cb8a071d1cb63c2d SHA-1: b35e7db441b71c2f25c11e51a4718850a4f27fdf SHA-256: b70f24383ea2cb4a5a501b4e53faa49336b330007612abdf122410552ed151f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate these URLs form a link farm, with some specifically targeting WordPress upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the overall structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=how+to+hack+unlimited+bc+in+pubg+lite PDF link annotation
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ta50jlum1oao05p764kr5jhk7q/774775743.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/2983144756.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/76178222759.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160725d2b8d2bf---57709683038.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210503134429735.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/livovus.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/41691275280.pdfIn PDF document text
    • http://medi-sen.com/files/files/41180680073.pdfIn PDF document text
    • http://learningkey.org/userfiles/rotezuzux.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///16500122389.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/vomagawekopov.pdfIn PDF document text
    • https://inncredel.com/uploads/zexujor.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/34882473505.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/3576973335.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/62044686289.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/podasafasewejenoxowek.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/gc69392ibua1jb3183gi1a2ie6/13449118301.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zupogegimog.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/xaxazonizagidejukigu.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/piduxevawurepitebofu.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/mabixumizekokuzazenobaned.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607966daea362---waturefuponiforija.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/74e8df96477adde1cdebda058cf189de/18091451498.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10331 17580 bytes
SHA-256: e5afb76438ef3ad2f283cc2f249894d7b31eb58408ddae9d749e97e93c11e97a
font_02_sfnt_off00013162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13162 11104 bytes
SHA-256: 5321d3d14999fbc17b9d501ce8a2faa2c157f17168d8b44855ed154d1f1117c0
font_03_sfnt_off00014a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A96 17252 bytes
SHA-256: 3493483485badaecea36e822c7a2bacead31ceb39fa1b8bd094cb3273f28d61d

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