Malicious PDF — malware analysis report

Static analysis result for SHA-256 99aa60706e5123a8…

MALICIOUS

PDF

77.8 KB Created: 2021-09-22 16:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba2da52d80190d60d98a109a746e6906 SHA-1: 53e6ce60635afda55e3a3ec9759fcf1d3afe7589 SHA-256: 99aa60706e5123a83c873fe72e181b5e1b0cf696ccd4774f7565b775400e6bf3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised CMS uploads. The embedded JavaScript likely facilitates the redirection or execution of further malicious content. The numerous URLs suggest an attempt to obscure the final destination or distribute payloads across multiple compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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
  • 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 http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/luwotelirowadag.pdf
    • https://privatecambodiatour.com/userfiles/file/xokaviwatumateti.pdf
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/jivopolu.pdf
    • http://istihdamhaberleri.com/upload/ckfinder/files/67003463411.pdf
    • http://clinicaveterinariacene.com/userfiles/files/jibozajurinugefawozub.pdf
    • https://rossbeede.com/userfiles/file/zemuvazinovopofulaj.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613efa7619535---vubisowimipul.pdf
    • http://myappartement.de/web/editor/files/16357737597.pdf
    • https://nguyenthelong.net/userfiles/files/91578551589.pdf
    • https://purevdavaa.mn/uploads/ckfinder/files/timiniwefiruwul.pdf
    • http://ltpbetel.ro/userfiles/file/palakewalere.pdf
    • https://www.seblocation.com/ckfinder/userfiles/files/purexopekedozerigek.pdf
    • http://bluebiz.kr/userData/board/file/14760005279.pdf
    • https://naucharts.com/ckfinder/userfiles/files/94382066086.pdf
    • https://www.borzabadi.com/ckfinder/userfiles/files/98173033077.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2b45065394e3da7529dec46c5250c25e/kuwemudim.pdf
    • https://shirbandifelt.com/userfiles/file/vutolewololumalabe.pdf
    • https://senesi-sklad.cz/userfiles/file/96241755936.pdf
    • http://www.greenfield-sustainability.com/images/files/71805626768.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/ffa202f764b0f8e7d89ab56c9584d7d1/9915940077.pdf
    • http://ityab.com/cache/fck_files/file/musabubenepigunir.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f915683771---89838386214.pdf
    • https://fibra-optica.ro/ckfinder/userfiles/files/49355231281.pdf
    • http://dautuck.com/uploads/userfiles/file/vojeriwofesekuwowofozi.pdf
    • http://vibratingsieve.com/d/files/vosuvinadikakopo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=one+piece+free+streaming
    • 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_off0000cb18.bin
2cc9be30a2121c3be4663534757cb3cb80ed7941cb09f76a7d40bc103bcc4210
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB18 10680 bytes
font_01_sfnt_off0000e3a5.bin
c969c067f3d69f92ad54350c181be116bd4e4c52ed71be19a45768bb286f0b70
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A5 17900 bytes
font_02_sfnt_off000111a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111A8 16792 bytes