Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad892079bbe6a41a…

MALICIOUS

PDF

99.5 KB Created: 2021-07-16 06:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d396cf8f1ee0d4cedc45f38eab23b230 SHA-1: ccf01945556e6a1e55d1e820c5b21e2ed9c6f2c7 SHA-256: ad892079bbe6a41ae0cd18b458aef0252cd7cd27c62cd3f8445df677ed8d1f0b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to obfuscate the download process or redirect the user to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 8

  • 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.
  • 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.
  • 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 http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/f58dd5407eceec826f5032867f4064d1/kobozisugobo.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088438fb4232---zetodiki.pdf
    • http://peach2560.xyz/js/ckfinder/userfiles/files/72816176620.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/eralsljsbf36jsbj1srca71ol7/kabubevi.pdf
    • http://danieldesignpro.com/userfiles/91645656517.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083fe75cfef6---bitakowebesogeladoj.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a25ef8b2b9---1278635904.pdf
    • http://netmutum.com/userfiles/file/faxijesovoni.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d8b1405565e6ac6083bbd6348d528174/mogopoviteliwulip.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/09cc6795040943b244e3a7902fa081a8/fizunalomoxe.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608726f64dade---mabotidet.pdf
    • http://fitviewer.de/files/file/10330191693.pdf
    • http://cnhhgj.com/upfiles/userfiles/file/35581519424.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b1492440---77514702735.pdf
    • http://u15.ch/ckfinder/userfiles/files/51106978329.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/96f3b892de3c45a5b321a6aa9e32b158/66443682326.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a8e765b7e1c89c0cb2f3e9762b86517/26988170391.pdf
    • http://aaaexpressac.com/userfiles/file/10656868251.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a0433a92---mapawebikagow.pdf
    • http://dolphinkorea.com/files/files/bezuladad.pdf
    • http://fxmeat.com/upload/file/889735d563a0973dcec1ecbbd0287426.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ca9e1692e6f63fdfd63d5b9f9b59b4cc/vagedonopebosagalenojaki.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082f586f3bd5---kimevozawizowuso.pdf
    • http://tencanpowder.com/d/files/zadogepowevozujakifirad.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16072923661d06---dirowarivitokiwor.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=coin+master+free+spins+august+2020
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012177.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12177 16792 bytes
font_01_sfnt_off00013989.bin
e24a6d43e8c9a09bc28ec48cf2768a1b3a9d5193ef6fed92871187d79a4d6383
pdf-font-stream PDF embedded font (sfnt) at offset 0x13989 17392 bytes
font_02_sfnt_off000166fb.bin
dfa8465660b0b58499578b70c96cce1ed9babd99993ab4f8d8e773b3920caf25
pdf-font-stream PDF embedded font (sfnt) at offset 0x166FB 11028 bytes