Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3cd9d4775735be…

MALICIOUS

PDF

83.9 KB Created: 2021-07-03 20:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d54a08104e1f8c5d14d0eb03d3b18842 SHA-1: 9eef965ab5d621ada440f403990608a31f87ae5b SHA-256: ca3cd9d4775735bec3517054e52e97ea2f2bf7aa78d5a49aeb5feea1f90ab7e3
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of these links and the PDF structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=the+episcopal+church+welcomes+you PDF link annotation
    • http://huonglonghotel.com/uploads/image/files/befigebozij.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c235a868376---90403775426.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d419653acb---libiwomogix.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/59c1be4b4bce123bc752755de49e430a/zafajesulajosafiranorefu.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/lezijamavixijabizafaz.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/d7853b58ad81c8e3ae5606d16388bcc9/41065283194.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b7e7d966c59bb863c6e5b624922b28a3/fipuvakotomanunewafe.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/26749757736.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/viduwosugebum.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160773cc04ca79---mipojipi.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210615_03AF3F3CFD2A30AB.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/i3v0k03hbd4il9d70tmoa1ntk1/zimokupunat.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160955681b8daa---97726727485.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a566eaac5a2---sunofebukipisudowi.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/zevekuji.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/tawesigodej.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/9b5a108fe57eefd93a82fa043ca5e80a/74485091555.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864832aa9fc---48379376587.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/1fbgvqcf0pgat1te79djeukkk0/lovozobojoguke.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/jototabopono.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/notuvewapiw.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/089691eb8821832773acff8a7f0bdf8e/82808106894.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/kewujazigo.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_off0000e247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE247 10700 bytes
SHA-256: 865f612e46ea8faf9e9b1246f7d713a36a7db8f208ee8592b4b0e430e501f88c
font_01_sfnt_off0000fae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FA 17476 bytes
SHA-256: 2f8ddc35ac1a01bfb35b9c1378c8bdb3ea14ad44f83099c51e4747ffe730bb53

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