Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9d58b797227cdb…

MALICIOUS

PDF

74.3 KB Created: 2021-09-14 11:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa6a0c49774b568403c32e0e00e4d649 SHA-1: a86a98e4a36d0b19e1c6fd7279cd3663ba3e00bd SHA-256: cc9d58b797227cdbac9be316bf60931553a628c3eacb1ffc0aa9cd761df51fc3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The use of external links and compromised CMS uploads points towards an attempt to exploit user trust and deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=mm2+seer+value+list
    • http://cuoredicane.it/userfiles/files/80196286446.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/xosawudavelozoxenadosax.pdf
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/benagalinivuzut.pdf
    • https://landtop.com/filespath/files/20210910230936.pdf
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/boluvu.pdf
    • http://dajuicebarus.com/uploads/files/20800700264.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134edef36db4---litojazefozomusamesekimu.pdf
    • http://www.pacautomarketing.com/file/regazunaza.pdf
    • http://ithalattagarantibelgesi.com/resimlerfiles/pamajopimofekedufovoka.pdf
    • https://manpowernepal.net/ckfinder/userfiles/files/neranojeduzatotigilifik.pdf
    • http://pro-customer.de/userfiles/file/43821241513.pdf
    • http://vuoncotichdep.com/upload/files/65598852955.pdf
    • http://elitacasa.it/images/file/levudubulumutojifaxib.pdf
    • http://grimastone.ru/files/73970270684.pdf
    • http://npi-management.org/ressource/site-image/files/ruluf.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e68a8a3efa---fudemifazonipusuvawopeju.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fba765056b---fazurazojoxam.pdf
    • http://koovappadyscb.com/ckfinder/userfiles/files/3751047151.pdf
    • https://anhhuynoithat.com/asset/files/joxowozixolosexikunikaver.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/5beee080fd37ec139f2cd3b7a5c4e000/zukidiwixora.pdf
    • http://yjeverspeed.com/userfiles/file/42465961073.pdf
    • https://sportcity.bg/webroot/img/content/files/bepenekulubonedupili.pdf
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/50688682066.pdf
    • http://bargiel.com.pl/ckfinder/userfiles/files/72751387792.pdf
    • 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_off0000beca.bin
3d49fa6a07ec6794dd49aededfe74d6fa28d3ca5dfb04e64c8d2f89eacd94177
pdf-font-stream PDF embedded font (sfnt) at offset 0xBECA 10324 bytes
font_01_sfnt_off0000d623.bin
670c0979a620c56573b9c343f33459aa2fda47e491adeca6c9fd572489773331
pdf-font-stream PDF embedded font (sfnt) at offset 0xD623 17792 bytes
font_02_sfnt_off00010404.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 16792 bytes