Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cac5f80ece5f6c8…

MALICIOUS

PDF

82.7 KB Created: 2021-09-08 06:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 201230e6757ca25f41d70d871337dbf9 SHA-1: 380a98199c46cfe2d703ea90ded9e8c3f83d53b7 SHA-256: 4cac5f80ece5f6c80cfc51a96be64cca9919b1c313fe2b9b3c813c3225e5f6be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically indicating phishing and trojan activity. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160893602aa260---juwixitegixoreduxak.pdf In PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608caf9c8d8b7---metexupugubabejewata.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/wubukulanaxek.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/jojidekigu.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/77185938253.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/56201370821.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51f225785---33184997414.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210530020546.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/biragafozotinuriva.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/lerala.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1610f77463e5fb---fuzugaxuligu.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084646244421---paxixixu.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1621444160.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/luvetamulolawidusunu.pdfIn PDF document text
    • https://greenways.at/userfiles/file/gegefafopanubojevos.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607966b377502---30468078354.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/60968259664.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/1572718216.pdfIn PDF document text
    • https://yorapp.it/file/jomujor.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/efjatkn3rt2g9igjr5b0n96035/91965277948.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/42324437870.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/80111071514.pdfIn PDF document text
    • https://eclearusa.com/images/file/24902186454.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/fee75eb04630633a5c77cf469cccccbc/44719090483.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/tufojizimeruwujivuvi.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4d47e5445---52209125619.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/vewegijugasatujujad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=engineering+drawing+pdf+bookPDF 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_off0000db97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB97 10664 bytes
SHA-256: 1eeba32587aa5f0dd19fecbb5e04efb565b35914a4a31eb0d0e9455ab67c8515
font_01_sfnt_off0000f3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC6 18644 bytes
SHA-256: 4e14d29b30280cc417d6493c546069e1eec013cf938aa171e069dddcdc73851f