Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8d51fe39a2c88f…

MALICIOUS

PDF

90.3 KB Created: 2021-06-30 02:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 728252d1038433d11e70dbd1620d6b7b SHA-1: f465658af0a2b10e9c1a7170e3908a5e8dfcbff6 SHA-256: ef8d51fe39a2c88f760c1c5dcfb60fe87cee9d77aecd72579da17b2501446499
196 Risk Score

Malware Insights

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

The file is a PDF that contains a lure to execute commands via the clipboard, instructing the user to paste content into a shell. This is a common technique for downloading and executing secondary payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, and numerous URLs point to compromised CMS uploads, suggesting a distribution infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a192141ef2f---zexibezejuzetufip.pdf In PDF document text
    • http://wenxuezj.com/images/File/32738552575.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096a4624db1d---punopirujewe.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b59bf913e099cfe297cd85b2bad8edb1/21126675693.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1bfc48aea---wexisi.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/c2070ae987440679742348a0c3f07209/tokosog.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/avd92lmgvg03iavar5m4je2h30/geleda.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/35519826176.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-30/20210630072824471431.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/1bc8b30874948ea711f862c862b1a7ac/54135012934.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/55233099612.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7371c9613---mulinotes.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a97106ca9c6---59041485617.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc76363464---bewuzikaromibaleketaj.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/piwitibejovumoti.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/lebosube.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/miveporoxafisema.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160877109ae81f---12942991227.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dfe638ab6---31180811269.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeb9f574ed---lojolozukexakesobezufumig.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ucnmp653f38gofirges7l77hp4/sowoxojazibetam.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/a30f432c84be2249d60bc3e7490ab894/58127574888.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16090a4164e3ad---57218106096.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/zaxidapesapoluxedorufaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=word+for+not+genuinePDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B5 30440 bytes
SHA-256: 3066e3141657964951a55c6a3075b75b881e4882e57aca67788d6992e06b9ff8
font_01_sfnt_off000112d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D7 10244 bytes
SHA-256: 531e7afa7fce633605b260eac541f441909bb1b946b0832a828dece0552d7c60
font_02_sfnt_off000129c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000141d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D8 16780 bytes
SHA-256: 770a5657df5ec554eb8a162f3bf3eab9d243e12e91dc79157fa0f29fbe81a087

Open this report in the interactive analyzer, or submit your own file for analysis.