Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb41d199f962297…

MALICIOUS

PDF

78.7 KB Created: 2021-09-23 21:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4edfd84f4f0fba01b89b884438a3a6af SHA-1: baa0a8990f577e0f41ac07f0404d38a2a4918f24 SHA-256: ecb41d199f9622978d2b67aebcdea9cff2478c9d28f6e858650bd71e12d44656
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO poisoning to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://timandlor.com/userfiles/file/jedum.pdf
    • http://omonetach.pl/foto/ilustracje/file/39578947291.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16149b273858ca---12348805881.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144f34742977---10060035468.pdf
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/4981392855.pdf
    • http://creatinglifeoptions.com/userfiles/files/96611980056.pdf
    • http://1day2night.com/UserFiles/file/roteredewoxebimolurapodab.pdf
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/26194030168.pdf
    • http://gorsilawfirm.com/userfiles/file/25923999751.pdf
    • http://conservativista.com/js/ckfinder/userfiles/files/85306215808.pdf
    • http://gmart-express.com/demo/uploadpic/file/84290461694.pdf
    • http://perchegouet.com/ckfinder/userfiles/files/javovuvo.pdf
    • https://cherrychile.cl/cherry/uploads/contenido/files/kafevuvawubon.pdf
    • https://bahceneryaman.net/public/content-images/files/bidowagupobuvamimugena.pdf
    • http://unitez.net/images/newtech/files/zapojas.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143da2c225a4---10402955050.pdf
    • http://montagnobozzone.it/userfiles/files/58062712042.pdf
    • http://pasted-radio.de/web/files/77472627496.pdf
    • https://marblo.com/app/webroot/img/files/dotenimof.pdf
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/41612404157.pdf
    • http://carzip.biz/files/uploads/files/18778342213.pdf
    • http://gagutp.com/sa_upload/userfiles/file/20210918052845.pdf
    • http://davidhammerstein.org/ckfinder/userfiles/files/30616453537.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=doodle+jump+android
    • 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_off0000ceaf.bin
ba95ffd8e5964b8b0ace2aae857dcbcf92c71ab99a68c240c3b65062ccacaa2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAF 18236 bytes
font_01_sfnt_off0000fde8.bin
9324beebb0f750f234dec7c2a91f18ce4cabe1c6a7ae6b54e6b8d9744aa0bb66
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 10516 bytes
font_02_sfnt_off000115ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115AB 16792 bytes