Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbdb250409aaabb8…

MALICIOUS

PDF

96.4 KB Created: 2021-07-02 08:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b7564704dc16848257fff5330947cd67 SHA-1: d67d4ced92d7df7569cb579c04f24a0ad9a55c3e SHA-256: fbdb250409aaabb8856aad16633fe9db03244b9c612b3fff6d9d29005f6c5205
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely serving as a distribution point for phishing or malware. The presence of multiple links on disposable hosting and the use of WordPress upload directories suggest an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/31jej4ocl8ct5kdjofoll7ui80/36693272709.pdf In PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/47116973491.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/8dee275c20c3e820ec8b76774be3b540/woxukusowojuxikupuzozuxi.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a617072d4b2---79642684724.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/89165897629.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/75154824093.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/9db15255318cb04fe53bb4ccd133c5c6/45361278765.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/8q3v18e7tnkjmjl1s6ue1npbem/6945224552.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/xobemazonixapamavule.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/34498945439.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/xazelijojuvewi.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ec4df65416e57d5c15e824cb9cdf6014/23849230023.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607c433e1ad31---19307365651.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d00b2e8ed---zeraniso.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085f3e8af8d5---30334718439.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/vewasinejepuregemi.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/204f21e14900ac582fb4b32f126e5fbe/lofezaziriredevoxubosopis.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210630044727164660ojdfglhg9gca.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/jexadejuzezobaz.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/5350713566.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/79861106958.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/14536498048.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/datitexa.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/jugegive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=french+kiss+and+other+typesPDF 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_off000117e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF5 16884 bytes
SHA-256: f507548e7cda267dba530fc11440a400aa2ffca516e2af1d9498cfe96bc1591f
font_02_sfnt_off00015bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BDE 10748 bytes
SHA-256: c7cfe6a2d3ef879c049de9f02c57a5fb615621251363ad720c8442bedc9eb78d

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