Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99ebf8e40af6c86…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 00:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6bc9a47aeb2b0f994fb8a487f57ffed SHA-1: 067bafd304e1f50c871957412a793487d629c9c0 SHA-256: e99ebf8e40af6c86b4de81030341a46610cf53084cf7757e1c168d15760027f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ketchas.ru/uplcv?utm_term=facebook+overview+pdf PDF link annotation
    • http://it-hair.com/userfiles/fonitabezovavuxofususi.pdfIn PDF document text
    • http://mobil-tech.com/files/10506428809.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/0isfc3inqeebe69n0jijfuq9dn/8957910441.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/51782381760a8a8da11190.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/85747611181.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/pinurotisanuwaxujudose.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/37047793587.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/xajovodaxigalixisudewepog.pdfIn PDF document text
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/29555754283.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/jisitovuze.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/koveteperuxatuvamuzo.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/furuzajofufesixopajila.pdfIn PDF document text
    • https://koratspring.com/upload/file/5455880682.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/padoziwa.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/lunixobudo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/je8ard8mqgf7us09ofsnfb4an2/vuguwodemozobur.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/tisixegurawujovaximof.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/23605391754.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/16399801449.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e6319da46---dewofegijeteti.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/sirofekijijilatevosoz.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/846e025f1a60f908c8ad2c284e32ca60/27668048522.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/gikajizas.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_off0000d486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 18380 bytes
SHA-256: 2518c11488694a68e4857bc9db99c79394cbc318131827b1f86ddc8781362d2d
font_02_sfnt_off00011c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C69 10560 bytes
SHA-256: 6de3de203b2ab9b14a4117328143be3c7242f3479c79784b600416cc189d2ac8

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