Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea654139dae5e1d…

MALICIOUS

PDF

91.9 KB Created: 2021-09-17 23:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b369a690b890ebe0d154e13c6c9b2dd1 SHA-1: fa2886a8016afb0480404a34c52c0add9839d316 SHA-256: 0ea654139dae5e1d81ff42f3cb6a24df3ce249b1f184deb66cd75cfe671091e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics strongly suggest an intent to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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=jogo+do+naruto+proibido+apk PDF link annotation
    • http://domainecomps.com/documents/files/81083635212.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/regajaride.pdfIn PDF document text
    • http://lawngo.net/fckfiles/xevavo.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/10841572324.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/71898871440.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/matexatik.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/bamabani.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/96431367355.pdfIn PDF document text
    • http://xfswchem.com/upload/files/54066600458.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/kikuzivaxewezowotimutupav.pdfIn PDF document text
    • http://mega.kz/media/upload/files/mafimakipe.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/1673037887.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161415434cb513---82935772361.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630886483.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/rigiwimenazulage.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/96735864306.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/a78bloj40pphe9sfscvrl8pajg/27430212037.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/31906043395.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/32868203330.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/64375943666.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/95581428506.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/patufodemolixijoxunat.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130a40595033---kunetanu.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/vavexatozevovemom.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_off0000fb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A5 10544 bytes
SHA-256: b3d76185240bb1a8f8fd90a09755c21f4adaffa5b6e98ced046bb3361f0e1388
font_02_sfnt_off00012b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B54 21192 bytes
SHA-256: 1c6ddc75fee8c0b5ea95e51ff0fec83ed875e2c2adf53f5f0a42cd5efa6ebb96