Malicious PDF — malware analysis report

Static analysis result for SHA-256 388c184efad504d0…

MALICIOUS

PDF

94.3 KB Created: 2021-09-19 03:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1e080aee00928f360bea9de74f3565fa SHA-1: 32167cc9b5ad8997d85a0d38919b9c26cf16e5a4 SHA-256: 388c184efad504d0cab26ff434f7b24c6a0ed1d24079ab310c3fef1b4a2675ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute traffic or potentially host further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://forumsevens.com/images/file/dezojenudowulonupik.pdf In PDF document text
    • https://codecs.ro/images/file/92034859928.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/22044683554.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/jumixuguwazexefinurofized.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613be3bb69617---gawobazanul.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/zogenonibadirofurokix.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/pufesemesuronaxutasatodal.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • http://isotope3.pm-ural.com/uploads/files/fusavixiweluzubomorube.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210918111902828621g8ckk.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/63568880591.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143413e8e65f---xamigo.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/vd4ak98i8c8qupdnbg2boj3mk9/ruwutatitexadofibep.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613567e9211d7---69637609586.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139acecd7233---refupumuluwajapogor.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/36939770141.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/63126368348.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/xidexozip.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/84785550391.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/84420755237.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/88631695719.pdfIn PDF document text
    • http://sartor.ru/upload/files/42355845939.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/75488588090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=kanchana+3+full+moviePDF 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_off00010e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E68 17456 bytes
SHA-256: d9fe02e1934a2819c7f6e2d361beefa289bbfea15cf82d6dac05b71312eaf404
font_01_sfnt_off00013bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD0 10564 bytes
SHA-256: fb568938afaba23292cc822e990ca026ae5ce8d63bf97a4f08438adc957ec9c0
font_02_sfnt_off000153c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1