Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ae7d0fb003ce90…

MALICIOUS

PDF

84.7 KB Created: 2021-08-26 13:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f1794f3dbe94a7a21f834de3190448f2 SHA-1: 12e97394fa9833efa7b1782c93ceccb1ea03f26e SHA-256: b1ae7d0fb003ce900a45da70f1ea5e4d2e0e80b71fab99bd5850701b93c2b2ce
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates the document's primary function is to host these deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=how+to+save+email+trail+as+pdf PDF link annotation
    • http://bookblog.kr/data/file//files/dosawobawegemozeba.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/6096fecfdd05501b7417005f16b213d3/34847817130.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/zomuroselemexe.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/578caa415d1211c36dd1d78515362326/68181469178.pdfIn PDF document text
    • https://actor-conseil.com/files/file/loveguzeditamebujamewobur.pdfIn PDF document text
    • http://prosquash.by/data/15958306885.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/98500627612.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/19343015122.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/19122005876.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/p5ghk8k3coo514h6j284ofdkp1/48395324398.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/24931996507.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/97498514910.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/20612196856.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/lakagino.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98683fe0d---8600813329.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/25704095165.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/b92d6a3519f9b95e097d9b8295e06a90/wajefiki.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608852e5f09dd---31141029046.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/22242079973.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/mataxipovemodozazob.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b0d23560e---11016957417.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/15586521968.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_off0000e48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 17780 bytes
SHA-256: 4991c0e27816ea5939c133988d17b5a0de1941becfa9c35e773c4164b498faff
font_01_sfnt_off00011335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11335 10696 bytes
SHA-256: a8eb0a5d3b601e01a6d5455c59bb3bfa6e82c04b9b1a203348fe4ce0f260524d
font_02_sfnt_off00012bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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