Malicious PDF — malware analysis report

Static analysis result for SHA-256 696a09019bf4c895…

MALICIOUS

PDF

76.5 KB Created: 2021-09-19 05:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e790edb74fda12315355efb799ecb6fe SHA-1: 90df2e26e668d54f572857573f4b079a84b6bb37 SHA-256: 696a09019bf4c895bf85a8f23c73bd48794488402e0671e97a528fa932bcec35
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and multiple external links, some pointing to compromised WordPress upload storage. The critical heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs the user to copy/paste content into a shell, a common technique for executing downloaded payloads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for downloading and executing a secondary stage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hiroyoung.com/data/files/wegetokizegus.pdf In PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/pekufoteza.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/fuvokedenawigoje.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/gd6ihdr37ebec46jtenvr9bg9m/kewamudaniranezewog.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/81457946144.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/q8ovfn374t6nka778d29gdf1un/xesufuxasepopobojagexe.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/fawosawegemebororaveg.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/91736047974.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/0g106mtiif9nmmpb94eanrvnla/livunezazutadopasonifur.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/69441119298.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/192005459.pdfIn PDF document text
    • https://riwg.in/userfiles/file/dakuzibedeleserivi.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/164695305.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/26019882222.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/37777118349.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/21780145188.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/puwevitef.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/kozuj.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/18811091741.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/fujotidiliratuse.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/63047097375.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614095dec538b---64970290091.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/jasalirogibikubolefonebi.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/95676584188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pokemon+sun+and+moon+randomizerPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D8 18004 bytes
SHA-256: ef6a1d342eba5fb7e57f73bd79e4106f74d15f6adcea7faf10c43d2a5ac6c65b
font_01_sfnt_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD0 10516 bytes
SHA-256: f083ace1acfc512ed402f48efffd68a14e9c09493901c52e6ed09c2c9c075830

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