Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9eb6c03fbc1306b…

MALICIOUS

PDF

94.3 KB Created: 2021-10-09 12:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 20ff04ea3daf4c2b80c184f2e948eb78 SHA-1: 4a10152d15072ae95ccd5035283b707249c136bc SHA-256: d9eb6c03fbc1306b499fc8e32a8b72c0775868c569f2309446a8560bef2d99a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ceral.pl/ceral/pliki/file/kawuvu.pdf In PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/bbc75938cbcdec0263675d585907b780/zufujigumosasuvowutupiw.pdfIn PDF document text
    • https://websbag.com/uploads/files/59640399814.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/61849001562.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/0u1h3tl0a8crvasihocbaegttt/mufigukixutexujidu.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/67086028153.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/supizatukilezewi.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/toxukomoneruvujusitome.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d0b4abc360---58262998731.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/wazamemusapix.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/fuluduvatewel.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/789f778af12d6d372168c30a4ec822c7/xizijunajinakebesumun.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-10-2/20211002172335235108.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/garozigirivusixuwamew.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a3956710580fbb9c1c7db63b483256c2/zuledidawozibojotiwame.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/17815252200.pdfIn PDF document text
    • http://harlit.com/upfiles/file/gikepitovakumurobolagut.pdfIn PDF document text
    • http://soc-in.com/data/media/files/35837456301.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/44562672652.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613858eb634eb---60497604294.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/48495039212.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/683114434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=jim+sturgess+with+a+little+help+from+my+friendsPDF 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_off00010548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10548 20044 bytes
SHA-256: 37bd770254c0960ce6e835c8a9758599ad5aa490891b4d2eaf5941fe67ac8760
font_01_sfnt_off0001392c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392C 11236 bytes
SHA-256: 49c00c7a4e6adbd16ee91ff9c5687faf47f5aaba6610304d1df5a7434849859a
font_02_sfnt_off00015331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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