Malicious PDF — malware analysis report

Static analysis result for SHA-256 4018ca28f4730950…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 01:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 487df1a7937b086a9f2fe5c2f1033955 SHA-1: d605732e4068418cbf39aa1b5aa37757757f7c1a SHA-256: 4018ca28f4730950b58aa801cebfaecab6108ecd2063e370ee83a5822f220883
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=human+resource+management+and+development+policies+pdf PDF link annotation
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c05fc57cc---75865660017.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/jamewugajijofutimaxofi.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caad22a964---venojowal.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160895054bc7dd---85854249287.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/6tdd3hbdv0c21quio786n790k4/tudozurenako.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f94d5acdd84---nedupaji.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload//file/36411061001.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/barabolafukop.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/dudulokerekulimosos.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/ratepenopotek.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/diwebusorakavasuzomisuk.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3aa9db2486---76337539299.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b385125b591---fowodeliwufap.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/a137d76cff0d05ef450b9c658e1d0d10/75350625516.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/gudakiru.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/zumufibimabasodibula.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/kofopupubupugo.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9165b9cb7---bikosorubuvo.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/88504213655.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/jifapukokilesitozip.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/lifusovefo.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_off0000d0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AC 16248 bytes
SHA-256: 73982f8592fd8ef9ee1f0670e251fc1c3d4dcd8c65638b6c02a1bfff79ef9fd0
font_01_sfnt_off0000fa6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11286 11120 bytes
SHA-256: 5f55c5f547eede091e905d56a6ea9b7450acf808eb47c08841dd3327937191b0

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