Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ceb5a2be04ca4e…

MALICIOUS

PDF

78.1 KB Created: 2021-09-19 00:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b24f22dc85bc2fd692a3ba372e0385d6 SHA-1: eb83b92e3e3f37e3287d56b7d3c8d24c7c2d0dd7 SHA-256: b7ceb5a2be04ca4e8089b4ba49f63ccb5ff0bf7cdd843e9070d838fdb02e4014
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple domains, including a compromised WordPress site. The presence of embedded URLs and the structure suggest an attempt to redirect users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebcb5da9be---fosotarikenu.pdf In PDF document text
    • https://pecintajp.com/contents/files/wafovudoviduzamewidiz.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143b2dede81f---mosijede.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/kuzinaxipekatafexabidejaf.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/25657583842.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/dazuxilowategepar.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/vodosufewavafogo.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/20588186271.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613362ede861f---48950318069.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161371e2cc439c---38480995953.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613190f1a117c---gadidilabuzuxawiposim.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613adf371245c---jamisoguwol.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/tegifidadonanitajaxafifa.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/jedizusolozew.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/22874737709.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/budotakegowebabiku.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/1220438172.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/13527757323.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/7bd991ae620a8ee424cc05760306ff3f/xivinamuno.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/paputudavufejumifem.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/lanamowajirolowarurabe.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/54731832979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=accessory+development+kitPDF 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_off0000ce2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2B 10768 bytes
SHA-256: 4389dd2a5193626b763bf431767ae24450de35b1da4214f5aa57b1b51f422f7c
font_01_sfnt_off0000e6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FA 17052 bytes
SHA-256: db18e7d2aeef5254dfbc29484ca235aeee7baf0b960b930a03463d1df82d5119
font_02_sfnt_off000112d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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