Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a5ab7e7de8ca19…

MALICIOUS

PDF

69.5 KB Created: 2021-09-22 21:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: eaa18978c0ecdef0893c570a331ccc48 SHA-1: feaed11a2a574cbc79101a98f40b1e552cc66a45 SHA-256: 89a5ab7e7de8ca19017183f668ba124621b5cc983fbc8ce5c304874467cc8311
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its structure, containing minimal text and a single image designed to obscure a clickable link. The heuristic 'PDF_IMAGE_LURE' strongly suggests this. Multiple URLs point to compromised CMS uploads, indicating a distribution mechanism for malicious content. Although no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613be3cd44ead---fuwogofabubelawudutoko.pdf In PDF document text
    • http://metalzilemboeventi.com/userfiles/files/xifagexe.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/24883588944.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d318a3c2b---3679750412.pdfIn PDF document text
    • https://pcetravel.com/files/file/71088040493.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/t41smos4h69ss282uvrn8l6bp1/69513373808.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/s6im4u0gikhs3jric01tj5gfto/defetotif.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d804842cb---47293518321.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/27522343390.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/49595760158.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec17e6e3a6---14546764607.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/b8f4b2e5889ecf2200dcf1841f312ac4/6519595526.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/jumikanamadatuvalodador.pdfIn PDF document text
    • https://regenerateacademy.com/file/94747849033.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/23224178922.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/21939680255.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/tawudoterabubakizalu.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/85993651799.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/serozimupafitojewiva.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/28571537819.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/xareboxikuxixevod.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3c050bb74---guxiropamorapos.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c44f49bf71---82602833268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=iphone+themes+for+android+free+downloadPDF 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_off0000b39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39E 10800 bytes
SHA-256: f4b71cc803a0522b146879518ca710f9cbc5b4596edf83d3df07dcd5a2e531dc
font_01_sfnt_off0000cc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE469 14268 bytes
SHA-256: 6e5a57a6532c4c3c6dade222e5232ee49fdf2b29bfc2f277015cc0fdf376bb25

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