Malicious PDF — malware analysis report

Static analysis result for SHA-256 971e5a204dee0ead…

MALICIOUS

PDF

88.6 KB Created: 2021-09-20 23:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 97016530840ad0c94eeb9e4ecdc8a08b SHA-1: 3d5abdd0948c0e554b3f17abb136e42425c5e1be SHA-256: 971e5a204dee0ead17b978e51b7af4ded966029399d2ca03193b5870251cec90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather to facilitate malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://malagi.pl/user-files/fck/file/72920173948.pdf In PDF document text
    • http://sl-light.ru/design/img/upload/file/44384466673.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/faganujezegonub.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139f75279b91---58247943827.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/derusaxerarotatekiso.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/32315567167.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/nalijupidefebuxop.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/06cf808b8b4230d68076d3ecdf0f02ed/bezafoni.pdfIn PDF document text
    • https://panama4d.com/contents/files/58777017902.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/vorugepesixotuve.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/13671004381.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/99229227693.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/mudufeboduwevowepo.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/61726434588.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/dixepumofuw.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/tanig.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/64039415886.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/sakotediziguburiz.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/mb3drv8s2r3q7ds87o0emedsa6/15531223889.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/jitinejaxus.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/vovazusoviluzoka.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/25903676d93b925bfc2c84ecd80d9098/bazajesuvuvedemosuvaru.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/xagalifikoxasijaguduvoxip.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613637daf3253---18288619299.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161480e56e4221---mawukadevabagis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=diablo+similar+games+androidPDF 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_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 10632 bytes
SHA-256: 35905dbc9b0e49636871d3a85d7be0aa0743e655a84fed13b8a31d4660075ca6
font_01_sfnt_off00011079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11079 16904 bytes
SHA-256: 3a94661e92af2d3a21516d0c3e13a97cd584fb271441d9017bc9368d64be5eed
font_02_sfnt_off00013c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1