Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a0722531123427…

MALICIOUS

PDF

84.9 KB Created: 2021-09-20 23:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f3e01e335dbed538aa3f6e845ac2a57a SHA-1: c1b2c6d7abb1cad9e33cb90991f2369de259a444 SHA-256: f5a07225311234274d386f1dca2bdb8c09a3ce0a506ea5d20b2a246f41337868
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content via the provided links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://allytemp.ru/uplcv?utm_term=download+game+mod+clash+of+clans PDF link annotation
    • http://ryanoomen.nl/uploadimages/files/fajodo.pdfIn PDF document text
    • http://canvangdientu.com/images/file/difapukimupelesi.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16143d022971e7---petufukenanovefovevup.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/80256692590.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58545858337.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/48638960306de341b1df020055a1ec81/42810942061.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/kimelagabameriki.pdfIn PDF document text
    • http://tavio.su/files/file/kezinebuto.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/5932132681.pdfIn PDF document text
    • http://alltechsro.cz/files/jukamu.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/88714468773.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/31208804028.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/xusizatisasa.pdfIn PDF document text
    • http://dentali.cz/files/files/ronaj.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/b5ea7623a5f60a1bcaa7929f44531623/29852578249.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/liputivebegipib.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/94111251641.pdfIn PDF document text
    • http://abwessex.com/uploads/files/ruxuzafarorijerewasozife.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614138d2203b9---bomomikizug.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/qqur3psptv3m5uu86smte2mcnm/xesagagatug.pdfIn PDF document text
    • http://zaiger.ru/img/file/67011930190.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/gonudotida.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/76720923594.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/biwele.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/kugavikikavukodup.pdfIn PDF document text
    • https://energooptima.hu/upload/File/zesuvulo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95D 10720 bytes
SHA-256: d2013e0906ae1fa5f010e1830723d50c3d7f8bbecde384f2e3055d26e95a970e
font_01_sfnt_off000101a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A0 17084 bytes
SHA-256: 7a3090e701947bc3d9f39070a6fe854f200f6385ee28acd54fd317a54754a290
font_02_sfnt_off00012d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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