Malicious PDF — malware analysis report

Static analysis result for SHA-256 904891ac7b21b02e…

MALICIOUS

PDF

68.4 KB Created: 2021-09-19 08:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21c73aba4342125eb385860b3ecf21f9 SHA-1: 68b36d1a9f885e7f368b6b445c3d32e961da4b8c SHA-256: 904891ac7b21b02e7a1f28c004e17f7dccdb9af237976d526f93f67572b41b25
176 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to trick users into clicking. It contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm intended to distribute malicious content or lead to phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 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 http://progetec.org/userfiles/files/foketedoriberiruboruleruw.pdf In PDF document text
    • http://language-coach.pl/uploads/files/60237510584.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/96879304057.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/kaxisapamed.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/kikelaxemadifikapelof.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/risolafefax.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/503f0d3fd85f91b6b58022a17bd95e45/dorakusum.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/lidexalodipusufatapusi.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/daae51cf978d0214a6133985d0e0e3a7/fikutivofakesa.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/getowetu.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/35224505398.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/5a38f93444fb79f9cfd43e49f290ab91/7707217970.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/55025105745.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/45665243955.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/76202859289.pdfIn PDF document text
    • http://chikatere.com/Upload/files/18063413507.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390e72a23ed---95555755055.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/48793212543.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a7c6b032e---83415855071.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/16406838676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=big+soccer+headsPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/zodamapumelediwuvewavejiz.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_off0000b121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB121 10452 bytes
SHA-256: dc4b49189e303864eb9a515e2f59bfac9f3cb2b38e66b377abdb61c164ff5c71
font_01_sfnt_off0000c8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DC 14208 bytes
SHA-256: b9c062cb26fc10eb5f19c8e530cd7416e93197637aa2de84ca40d60c4720847f

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