Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f895b25b8ddbce…

MALICIOUS

PDF

83.5 KB Created: 2021-08-18 07:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 386d78908b1f7eaf7c24b28fd719d6a9 SHA-1: 6966fa6f2cfa8ad5d7de7dd6b51ff6ef125847c3 SHA-256: e6f895b25b8ddbce1ead3b43c5375b98e162caf7a30963ad0a991f8f77d451eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://archissimo.eu/userfiles/files/35230188011.pdf In PDF document text
    • http://czdashan.cn/uploadfile/file/2021050707315373499.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/repinetazisaju.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9f058b08cc4f7554c124b132e2a67c36/55142742384.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/14696210121.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/63234660803.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/4760349024.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/36915758581.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/894b6b7b7bcb1fb7a13ec39024141a33/90554073767.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d88426907a---27230177197.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840fb28caaf---57456624396.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848543eafed---gokapanoziwu.pdfIn PDF document text
    • https://curvy.tw/upload/files/65853163061.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/pomozusexububenenifil.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af44cb3cd3---jifijok.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/gipitabiganizo.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/lebipuwadobobuzaba.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/tujovimiromejemo.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/sefar.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929e67be0eb---70553306107.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16086822a6564b---nezinul.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdcadbe2dd---libupipimediruj.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a9afc7d01---wologomagisor.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/wavadugopone.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f69b703aaa5---97722875580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=mobile+suit+gundam+extreme+vs+maxiboost+on+ps4+gameplayPDF link annotation
    • 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_off0000dfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA2 16584 bytes
SHA-256: 24bbb4249b13b8250c23595db9e13a5c4abcd01eb910fd9519458ff6fd65878c
font_01_sfnt_off00010aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B7 11328 bytes
SHA-256: 2b0b281340a826682bf43472f65de7d0c8b38d3ce6cc64da597aab1f838226bf