Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a42e51c4b4dbda1…

MALICIOUS

PDF

72.1 KB Created: 2021-07-13 17:38:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: be930e2896097dc26050cbb166644075 SHA-1: 49826e88931d4eb2b511bf0b90bf9e5a49313eb1 SHA-256: 3a42e51c4b4dbda1dc061d91467246bd94c698a4a50bc0cd6abe013fecaccd6e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077a12a5ce39---88712589612.pdf In PDF document text
    • http://asbu.net/uploads/FCK_files/file/turobekujaxowa.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bedb7d09899---reniba.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61899205fe---pamizotofotufufujixolegi.pdfIn PDF document text
    • http://azizolace.cz/images/file/zajenogafivowavaf.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/t6185vgrp3ebg46mkpoaa4kanp/80600421523.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/20486410020.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad0c295ba9---gizipuzitujiditagibiwekip.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210705055559.pdfIn PDF document text
    • http://francisfamilyreunion.net/clients/870293/File/62162899269.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210510031052_888203979.pdfIn PDF document text
    • http://short-story.ru/upload/file/34460080418.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/gavofodevibozisunemag.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab009e29862---tipel.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729dc561512---93365059302.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/rafufasutezi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5c609959f---68250349514.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/77865161390.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/fifisigazejew.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/42346270560.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/39515905150.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/52333869572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=introduction+to+aerospace+engineering+by+anderson+pdfPDF 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_off0000b652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB652 16500 bytes
SHA-256: 7f2af75417f1dc076a4b1752a6e6a3fb8ac8a1af0b7d21bb8d5ef50bc773b68e
font_01_sfnt_off0000e150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF967 11052 bytes
SHA-256: 4534106f129cc0cfae61480aa4b86fa26288223c9049b451e00fd12a5282bf04

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