Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8d5a15e2ec2588…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 07:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3ef7fa925caebe00d1d28b8577f32717 SHA-1: 09d82b3ea1324f7c1bfcf0a1dcb5287efce0c98e SHA-256: 4d8d5a15e2ec2588ce8549b5753737883e9dc763e429c10a1c9d45d837458b5d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised websites, including WordPress upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm indicate a likely intent to exploit vulnerabilities or deliver further malicious content upon user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://resortvillairene.it/userfiles/files/favubuw.pdf In PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/kikeluluxatevutipisej.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160d377da2e22e---fukivomurasididab.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/f473e1d65f1682d4c7e7ed1bab9aa01a/62614185962.pdfIn PDF document text
    • http://ewtch.com/upload/files/248294017.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/86207649477.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/migenilewopejof.pdfIn PDF document text
    • http://fedoro.ru/upload/file/3393086043.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/7894544691.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a7674e01a021d399e27bcca6018ac822/85764547950.pdfIn PDF document text
    • http://vucert.vn/uploads/files/51574262643.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/24138164168.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/24213617658.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607776eb3d7e2---38953493214.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/33658666913.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1f36ba2361461dbef59fdef9285530e/xokowaxadakunid.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/33068144863.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0c9761031---60614707432.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/gidesufifixu.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/1de33797ce615b7b3c4f7b165f2070f3/ridezedirab.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/65094404895.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/94221102311.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/14955444146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=alt+in+dogsPDF 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_off0000e474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE474 17972 bytes
SHA-256: f71552ee16a4b3c6ecc1ce129a2f2238221c34d06dfc2650d76afd7f8b859713
font_01_sfnt_off000112ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FF 10008 bytes
SHA-256: 61c62ede40c6175699a711b96b8d6822f90c26f29bda2f6f9c907d8278058610
font_02_sfnt_off0001290f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1