Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5a5ce8e49ce68e…

MALICIOUS

PDF

83.2 KB Created: 2021-09-21 06:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e57369666552a71b67deae09f70e92e8 SHA-1: c265367f6d458fddd4c8b0d39bc52ffb30208619 SHA-256: be5a5ce8e49ce68efe124658493215050792a8d99ca3f803750e04480334c680
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. Heuristics indicate it's a phishing lure and a callback lure, and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the nature of the URLs and the heuristics suggest an intent to deliver a second-stage payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://cructi.ru/uplcv?utm_term=ml+kit+qr+code PDF link annotation
    • http://xdata.pl/app/webroot/img/ckf/files/goxifuzafexitolas.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/28810135262.pdfIn PDF document text
    • http://lgassociates.in/uploads/roroxolukebufuluzabeg.pdfIn PDF document text
    • https://datajournonepal.org/files/jirifepiwik.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/72630998216.pdfIn PDF document text
    • http://imaginove.eu/data/Files/xodubujigerabokemujitiro.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/xaritifezajon.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/lapinalotamarepus.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/kerolubetawazomotovomidel.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/mulikoserimusib.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d2e100c54a41a80c1cc3ecbdd6475b8a/50996600370.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/xazusotuvedad.pdfIn PDF document text
    • https://codecs.ro/images/file/wosusoxinese.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/90588426252.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142a2944804e---liwekorawukawelajuvaven.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/55627806203.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/546207649.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/bf2ccab27e50be3c8ba7a2f3e1b1040f/foxelatopawigukefexa.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/62370661600.pdfIn PDF document text
    • https://intersat.lv/files/file/96154879717.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/foxugavulajazupi.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/kivexuxixuvite.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/hh77c1gu5otbmc13mn55sjf4pv/57045294441.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_off0000dffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFA 18824 bytes
SHA-256: b7f1f1cb87c4c3851277788964c05365cb839e6a229cde87e54d7d02826b9890
font_01_sfnt_off00011066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001287d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287D 10160 bytes
SHA-256: bb0ac02c15306e9c130e2aa668f07a3cdf050514b704d867c740b03b73f984fc

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