Malicious PDF — malware analysis report

Static analysis result for SHA-256 d512dc23ea78cc1f…

MALICIOUS

PDF

75.6 KB Created: 2021-09-08 01:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fcb451403de01eddca3a632805e1d4e7 SHA-1: 28c5ee77437756d8304e2f13269aee857a6852ea SHA-256: d512dc23ea78cc1f6383ec974b2f0a964a305f12a70b46eeac229f3a7460e876
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF that exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting an attempt to obscure the true destination or host malicious content. While no scripts were directly extracted, the PDF structure and the presence of external links are typical for delivering malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/1b0b24ccaf84e20185f56ff4f9890687/gatanek.pdf In PDF document text
    • http://jikaramen.com/uploads/files/debomovugafoter.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/farerosunize.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/44714535567.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b31a2042dda---64575734797.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/35988c54726551afd52055ffa68aa2a9/32663165602.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/nesefajajawaz.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971131529f2---luxawebakegotuxilo.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/36588548734.pdfIn PDF document text
    • http://sireny.net/share/files/48365016850.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/48940832184.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/48049485381.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/zadiripugavufugikobow.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/55027673746.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/61437051024.pdfIn PDF document text
    • http://katachizu.com/img/news/files/vitemenasizi.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/rejarevutobixizabune.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/desiz.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/1659b70bd34efff76aa18f06d49cca2d/pubifomivuwifevaguvunizi.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021625351355596.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/kuzovomozebedojiwixebewum.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/74974816143.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/41540000364.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/2rv30k6og2ha6aj3r7eopkjsdh/jilenovatixogiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=huskee+lawn+mower+repair+manualPDF 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_off0000c75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75D 16244 bytes
SHA-256: 2bb91525c378b877b5cf56a704bbc298275af6e64145e9dc0f1327f5730375eb
font_01_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 10584 bytes
SHA-256: f37021d558bdc6d1aa81d5a8f0ec3d411e42978bfd68169b616601e8b69d20fa
font_02_sfnt_off000108cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1