Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5524eb4aecbb688…

MALICIOUS

PDF

81.2 KB Created: 2021-07-14 05:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 05489e917e8b797878079117309c0e3e SHA-1: 577e499ff846faffcbe145a4606676734deee955 SHA-256: c5524eb4aecbb688fd0430ce09ea79deafda9ba41b995fcda1cc1990d7aa188d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites, potentially leveraging embedded JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://casabresciani.it/uploads/file/34721177147.pdf In PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c252214b8b7---30586220970.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0a9ce131c---53087565672.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d177e652ee---47518485315.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/vubulajezuzufajatuj.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/didebewiwumumij.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/301904072473.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/99039750376.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60bcb59a3788d.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/890a8c600ce0a5098dc65d0f78392955/2536022059.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/5jno1qbrfinb8e03qbnobql6rt/bebuxiw.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160760bf5b9db0---vavoxujogawupefedur.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/kafimazaj.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/guxukijigej.pdfIn PDF document text
    • http://jar-ted.pl/file/98528462313.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/lesotoluniloguridogi.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/gososuluwemomopemamanune.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/13930477626.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b66e223744---50743907438.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a67011dff---kaxiloxib.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/10371522212.pdfIn PDF document text
    • https://qnzar.com/files/vesed.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/c4r3i6vr8iplmku8jj67tukmdg/salomokedug.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202161624258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=costa+level+2+and+3+questions+examplesPDF 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_off0000d9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F1 16896 bytes
SHA-256: cced6ff5131a4e6ef656d23e167ea90300c71738a43b5ca927069e80c2f97fd7
font_02_sfnt_off00011d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D69 11192 bytes
SHA-256: af593e0adf8d65e80f4afea74216c80038e2410d63c00cf6c90f40dccb573896

Open this report in the interactive analyzer, or submit your own file for analysis.