Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f6934a6cb181c9…

MALICIOUS

PDF

84.6 KB Created: 2021-09-06 03:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ad7a54e20655dc67e3f3c653004cb2ea SHA-1: 8f74b4200f755a69179279129d20dae0a075dd7f SHA-256: 31f6934a6cb181c990c0f704a29db31522782d5f3e429255c584a5483ae44e51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://allytemp.ru/uplcv?utm_term=traductor+en+linea+de+archivos+pdf+de+ingles+a+espa%C3%B1ol PDF link annotation
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/886dc4bd6edaa376e9fa38100a7f1433/viwetosuris.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/sisogolafexerezid.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf834940670---genotekozijunemogakeb.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/mamogixuferadorawu.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/85663880872.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/902660867.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/xewom.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/8cfde9e8ce044e246b4cb79650a5b8a7/37441839686.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/df221f022883170bf9d6391cfa604209/10591994396.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/16773192546.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/mipugugom.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/zugugofunetomadexixora.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/roruvexo.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/13480156899.pdfIn PDF document text
    • http://oceanstatevolleyball.org/clients/879495/File/jexenarovosokadelapume.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/64505283972.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37adb777be---20761899358.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/k2oqg3bdc8bcr8b3sihktfjil8/lapizeveret.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99ca59368---58097578854.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/63f8fd2618792a93546254d134ecc1b6/40510639215.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a9868910bd5---logajiludir.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/73312328587.pdfIn PDF document text
    • 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_off0000e145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF957 18356 bytes
SHA-256: 81b63b62f5e1dfda05d90ea37eba47b20fdf03af49ed745ed45f2d59d37b8890
font_02_sfnt_off000127d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D8 11232 bytes
SHA-256: c6938e5188515d68f135e28d5470a84217bcdb02a51e539badbfca56aca255a3

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