Malicious PDF — malware analysis report

Static analysis result for SHA-256 457202021c9d8b91…

MALICIOUS

PDF

85.6 KB Created: 2021-09-18 21:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 46e6562ffd08d0aa42a11df1a50da4b4 SHA-1: e16481457a87d2f8493ba385513c5e6f4fc34b86 SHA-256: 457202021c9d8b91ab290a7b8a83051a0d29112bd63c5f1b2311b3de174e7e36
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm used for SEO manipulation or to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://specializedfacilitymgt.com/public_html/userfiles/file/20164816845.pdf In PDF document text
    • http://lerucherdesanges.fr/userfiles/file/jeganadubifugew.pdfIn PDF document text
    • http://halaljones.com/uploads/files/lenakadovanemiwogu.pdfIn PDF document text
    • http://vinmexindia.com/uploads/botiwifixegep.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/43502029378.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/5964941081.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/4936492177.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/9mgnn1ees34583iq693u8vemv2/46137223731.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/pegisabimedusugexegof.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/657728756891631111840.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/zigevurodimepiwolavevoma.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/titode.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/45103198723.pdfIn PDF document text
    • https://shevian.com/images/file/gubexixezosidizuditiwuxex.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/cktrqdpobm1uapjbrqmc165h11/derolipenudigejigezibune.pdfIn PDF document text
    • https://andrejc.si/files/file/78654983425.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/memiposeporozujogotul.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/af8516b1f5a8e2cf2b54f3d32bce2dcb/36627135532.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613baa2399691---gedokelafagofeso.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/zujiveto.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/xakobatavotogalisonom.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/0c20d85a4072a331ebd139af450b3bd5/gufujujazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+get+rid+of+cookies+on+your+android+phonePDF 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_off0000e82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10046 11236 bytes
SHA-256: 01725e718eb9e77e18bac9c4f4e6173b79c80fd8683ec1d80a0567de7c92360c
font_02_sfnt_off00011a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A68 17620 bytes
SHA-256: f454406869fa1d52d5b77bb95726bf0af6d931dfd69f455e93f11abc0d4ad552