Malicious PDF — malware analysis report

Static analysis result for SHA-256 de201ad427b160cb…

MALICIOUS

PDF

94.7 KB Created: 2021-07-27 20:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 12b7a12874ce70e37b0b2ef9e32a3cf9 SHA-1: ff67218a8bf44d6d17623b065fa3f837850619bf SHA-256: de201ad427b160cb2377f7e5e58669547f319965753dce7d9482f3c378b7577c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or conduct phishing. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or the redirection of users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d8df91124eac20778e1da52ec32fce1a/58976642428.pdf In PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/24c0057b6054b66b9b18257ec9bff435/koladabeligiwok.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/fogupedetoribovoti.pdfIn PDF document text
    • http://lawyerupsmart.com/tempimg/file/22727492754.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/4qveg7q267a6bfa889jbkq13n2/31718627620.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/14797435380.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/76891402641.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/cd14e4f5ad2956901981d0b0c9de2d2d/18714988993.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16d4865d8e---93772997669.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/64979508576.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/5382094929.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bf893cabe---tixuwisimalirinafuse.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/rebavamanafixuwas.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7cff73b95---54972863610.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/cd9c1ee8c2a4f600bcd5d186a89be2c9/38900711476.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/78046619021.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160724879d2a93---vomexapudukogedekalate.pdfIn PDF document text
    • http://m2m2design.com/userfiles/tawiripuzuvuwepebaraz.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef5236df3c---joziw.pdfIn PDF document text
    • http://zerosquareonline.com/file/46525267838.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a84ddec6492b9b7c54ac647d77370668/95514624610.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/9f3d64b3b04f2cb9d2d24e2a32e4eae4/49869231725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ley+de+lenz+ejercicios+resueltos+pdfPDF 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_off00010e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 10812 bytes
SHA-256: 1ee276691a7f05236dd1602bc8e284f08222f7dd8d5ba6e7be2decb6be17dfeb
font_01_sfnt_off00012722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12722 16600 bytes
SHA-256: e666f25eafd429081202bd53f0d68effb39d0b1beed5e344995838129c96e456
font_02_sfnt_off00015233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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