Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6dbd390b1666fa…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 05:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ce2c160036f36c8066e728fc1736c63 SHA-1: 73a551b50ee5f9e35608362e7aa6578475cfd2cb SHA-256: aa6dbd390b1666fa8aadd55aa403b496ac95fe80b96246cdbfd2efe7a1893691
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the interpretation of this file as a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8309caf7bbcbc9805818c50b00356a7a/sujotep.pdf In PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/folakuduwigarinituwa.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/nekasolasovo.pdfIn PDF document text
    • http://prompol.com/media/file/4707167579.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/zalixijalugoxebu.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/lutiposokaki.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/burerabita.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139861a1b676---22760049536.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/mizufajiwizitadiwizu.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/fajabejat.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/joremawilenotosusapesimaf.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/63936870753.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/fejigivepubelakij.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/42841323375.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/94859509708.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/tigazakifutebim.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/dajopir.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/46848462635.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/xidijexugoten.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/43275362331.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/pirisogozo.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/63587870318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+do+i+do+with+ancient+debris+in+minecraftPDF 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_off0000d2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BE 18008 bytes
SHA-256: d0cec69ef705ec0228bb96aad2dc422af3078784951ec9150d187f3bb9c8f2bd
font_01_sfnt_off00010200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A17 10916 bytes
SHA-256: 1fd9785dea3d469916b17f0cd97aa156246350b3559835032f730ad39d734877