Malicious PDF — malware analysis report

Static analysis result for SHA-256 914350e178f95581…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 02:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb90cbcc536c310482eabcd8d9950a89 SHA-1: 4848125782ff4cfec3fbe77632c39f36d536c78f SHA-256: 914350e178f9558197edd01a11e413e018a1646bd7d81000bd1cbf454a4958fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these external links. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://drafthe.ru/uplcv?utm_term=neither+at+the+beginning+of+a+sentence
    • https://losaltos.com/wysiwygfiles/file/64536182213.pdf
    • https://vonia.mikludava.lt/images/files/82288296245.pdf
    • http://thechitay.com/uploads/userfiles/file/zujotidunuzudone.pdf
    • http://kdesignuk.com/userfiles/files/miburatojed.pdf
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xejubisexuj.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbc6feb06b---8136156069.pdf
    • http://kaitosushisb.com/uploads/files/mutoxa.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135585fa592d---3757817908.pdf
    • http://esebtekstil.com/resimler/files/fatalapenedoj.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/12cc4f90521099eb3c1793327c5d1d29/bobezofojezena.pdf
    • http://peach2560.xyz/js/ckfinder/userfiles/files/7764913920.pdf
    • http://rw-hse-businessconsulting.de/userfiles/file/33208955465.pdf
    • https://rolcsi-bau.hu/userfiles/files/wunokuvasaxomopuvuna.pdf
    • http://zzfcw.com/file/fkimg/file/sojaremodebakusefe.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425f7dea5ce---loxikosigotogozunez.pdf
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/pebakixawepox.pdf
    • http://www.hgbehringer.de/img/files/files/kiwibexafijokebazugitenud.pdf
    • https://upaspor.com/resimler/files/96139749433.pdf
    • http://transgusto.ch/userfiles/file/pelaguxapirubutawob.pdf
    • http://shukokai-voves.fr/userfiles/file/wuxaxoranewes.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161357b9d7d2c7---25097779437.pdf
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/pajemowip.pdf
    • https://rubenferro.com/userfiles/file/28326560151.pdf
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210912140329.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_off0000b463.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB463 16792 bytes
font_01_sfnt_off0000cc7a.bin
dedb1e2fac4d6efb0cc2acb3917d082fa06f321fed4a82c018663cafa91e2336
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7A 10688 bytes
font_02_sfnt_off0000e4f3.bin
705720860e9491c6c8f3a5f8c21d4a9dadbb5685a00bc6059acbaa6464546976
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F3 17168 bytes