Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc5a5f914e0bc2d…

MALICIOUS

PDF

75.4 KB Created: 2021-09-05 11:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 79d2dd68ad8472e5a41b9ebdb61d5a73 SHA-1: 1adc950fae597e4c2f7b03d745d328256f851474 SHA-256: 7dc5a5f914e0bc2d6393eea3a70ba9a8353d7e80cf275cd75a96ade5e891ca16
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, hosting numerous links on compromised WordPress sites, likely to facilitate the download of further malicious payloads. The presence of a 'download button' heuristic further supports the phishing or social engineering aspect of this attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d779b5f60---14815283692.pdf In PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/cf84f0a200243e751c32dd3022e320c5/xotojun.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/l33s3n7iib92ojm66fedajta33/13709524418.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/dd7e2db8ed9a91680adc99663c803d5a/93415132828.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/gewixuvakajapetigifok.pdfIn PDF document text
    • https://werbemittelag.chupload/file/27167915000.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/11519928972.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/85971094252.pdfIn PDF document text
    • http://grandchainfamilyfoundation.com/clients/85333/File/xosuvukesal.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/fuxotezubozup.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/64732233750.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49799746f6---rulagevetumabevepodoko.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/zumujix.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5172c1f3b---21751845927.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/pisegivati.pdfIn PDF document text
    • http://industrialdevices.in/uploads/79314441384.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/40222582912.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/egspdikqrb933bukl1ncigdep3/radunisapodeziz.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851088e4247---63357197859.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/gizowepaguwatunilegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=canon+ip7200+service+manualPDF 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_off0000c224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC224 17152 bytes
SHA-256: 1bd574fa39bb97f12d2ab9f137339cb221eaff02d4c46fc855a93bc0a5b7e307
font_01_sfnt_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 10924 bytes
SHA-256: 29bda657d202ab3ef07554de89226bfc97dea19f894323457c675518371d5a5c
font_02_sfnt_off00010849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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