Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f44625e46c59d06…

MALICIOUS

PDF

84.6 KB Created: 2021-07-16 12:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 301aa0926639e84204627f496b2abe8d SHA-1: c41254a78c622150c64aa279cd91448d8465d788 SHA-256: 4f44625e46c59d06b2becc5dbdf603647c1b0e0cc951b7d8aeaa9d239da9c8fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure suggests it's designed to lure users into clicking these links, potentially leading to a malicious second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=total+english+class+9+solutions+2022 PDF link annotation
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/vq2hnt19dqenqbjuad8mm1avh0/lugebavigon.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/90be279b9ca6aa3122dd929da8d74db3/vejibuwoledakurevowavif.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/zubazanoridurowanotunen.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021731416564394.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082487ed53eb---62879736430.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/dc53da722c50a790ce331c88ac786dc9/13733985376.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d24458a57---zikawujixarepab.pdfIn PDF document text
    • https://premium-house.uz/images/file/xakezomotezazejajevino.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/b3chc38obufrmsbs0r2p2kd73t/14445860450.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/2f6eae2248305bee83ca3f41cf851ca4/19682376608.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/4904008321.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/1uul1i7gfrsgoj47lh6i11cnio/93014132022.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/47777172979.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608897a79aeb8---rikedu.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32679562b3---28944197278.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/fidoxiturapikorusuminibo.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/ludumibolefasilafite.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210501205957.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f616bd45d0---vavofanulitokifigulu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/4dc4cd104bc02f562b89e0549af70604/89922266501.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_off0000e50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50F 10884 bytes
SHA-256: 6395b068acbbbd3974a105a98af53eb07684f2a6f737b02b270c552662ea4b2c
font_01_sfnt_off0000fe43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11655 17952 bytes
SHA-256: 441fded7e1a4348e94a9408fd1cd9ce980bdcc7bfa7f8cc6096402351f52aedf

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