Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8e0b7607542739…

MALICIOUS

PDF

72.9 KB Created: 2021-09-07 05:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2dfbbdf9bce65888709855fba52314fc SHA-1: 117d5850e2e9b73cc865fe275f3ee3b9af336a65 SHA-256: 1c8e0b76075427398b7a36fda370cd013a980ffa12cedb3235d0a975bf9ff97d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the ultimate destination of malicious content. The presence of 'utm_term' parameters in some URLs further supports a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=oberoi+hotel+menu+pdf PDF link annotation
    • http://cartopack.com/Images/file/19742938900.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/gepafagetiwagekovobiropi.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/014f4107a70f7964c3c69fe67b854421/79426094400.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/70190763825.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/beacada1e4e08b42f63139d3f8ef8dd0/55715440139.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081881496c72---82139666023.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/29027406929.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/zofatopujano.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/rosebozimoxoviruligikiwo.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/nogow.pdfIn PDF document text
    • https://lesura.net/userfiles/file/30374294942.pdfIn PDF document text
    • http://thejosephinebryantfamily.com/clients/48776/File/vomonitigerize.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/32a2fe668a9d0e76c12329e669b25b6e/65723927454.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085edfd20bef---tasazuwu.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/devetisuzoxanatoladikij.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f68bff40f6---58215538968.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c94b1e26b5---14526038684.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f78b44eb19---mujetike.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210725112737.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/85811354668.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620300480.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/967e5924f9eaaafe0fd9d58a8f33a570/wigazeb.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608efb1a2ab18---bugapa.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/d3c7f46e769524f92289f7ca04bed6d0/52346913119.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_off0000be62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE62 10696 bytes
SHA-256: ca37acae1907c3b2955223a6df6c7a394ed98f8a7e6c5e05ce253839b8901290
font_01_sfnt_off0000d66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66D 15380 bytes
SHA-256: e28fd15ce285a5a87b519eeffa2e40c3c04ddc4719d08f95809c3b0c136ad5b0
font_02_sfnt_off0000fdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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