Malicious PDF — malware analysis report

Static analysis result for SHA-256 668d8e976ca285b8…

MALICIOUS

PDF

77.0 KB Created: 2021-09-06 05:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 094a28dd8b9946eb70aa1aa80c7ccea9 SHA-1: 7d7ae933dbb2988c22ae19c10485446a1c42f174 SHA-256: 668d8e976ca285b8e5ac11fe8f020c51287b021a2abdc6513403295e06ffeef0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and link farms suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://inwebjor.ru/uplcv?utm_term=cvs+health+blood+glucose+meter+manual PDF link annotation
    • https://burlingame.com/wysiwygfiles/file/25923605231.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0555b09906---80229393642.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/87rckufnjjj03gb87cflauh426/87144408025.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/52g71kbqc2qc677l6suqtc99s4/85808067554.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/zezugenagubewilof.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9fac56181---tajipeximopikimikabixiko.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/kisuxogobojujinig.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/tawomawemipupopa.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/83833391339.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612e249c100b8---22538099504.pdfIn PDF document text
    • http://edwardnugent.com/userfiles/files/19925748811.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/74408605192.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/fijil.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/24140809687.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bb58e44e4d6---51302912311.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607feb0819a21---fexevepelefos.pdfPDF link annotation
    • https://gegeny.hu/uploads/file/fuvozibebadib.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/susajanoxaw.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e62992bad0---11881684301.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/nuvarep.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/didexo.pdfIn PDF document text
    • http://cga82.com/admin/File/bezufunaxajivuj.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/sibev.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_off0000c83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83C 11060 bytes
SHA-256: a6beaa2b9edbb193b26da9cef509a3eed0b01439fd0968c2776523a30417b025
font_01_sfnt_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 17160 bytes
SHA-256: 41d82c98c2a4ab36638b23767821191f61ccee5d0208e7071ccfc79a20dcd678
font_02_sfnt_off00010e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1