Malicious PDF — malware analysis report

Static analysis result for SHA-256 707d641695aa631b…

MALICIOUS

PDF

79.0 KB Created: 2021-09-02 13:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5956d3f0ff4a3505221987078fda43d0 SHA-1: 5b2eaeb3d0458fb43d17e9d7df1d35a726c57bb9 SHA-256: 707d641695aa631b3bdd01f8114a47f41f95fb0f21d55f1352bef6e4e15c05a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate an attempt to direct users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=halloween+worksheets+free+printable PDF link annotation
    • https://agencement-menuiserie-var.fr/stockages/files/82438190008.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/0b4ce422bda598a72934e34a2b9b1819/67246566087.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/1641221060.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/69320921605.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/jakinunasojapaxevajomepu.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/oqedaturf65gvsc790gimqhkqm/ruwazogalunafogido.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/zuvoduruzem.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/49569523062.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/majufapek.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/juziva.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/komagotonakijufaxat.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/78b2k40klsdvidbdbeuqirg6vh/88472319209.pdfIn PDF document text
    • http://amandamaitland.com/images/file/vexav.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd407ea5fa0---xaripifelib.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/60164295727.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6a4df47e43b2cc29061fd9448163669d/sifoduzorufonatogufipum.pdfIn PDF document text
    • http://all-premium.com/user_file/files/tusopulawelemixunu.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/jelujoperufenumira.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e18db7d9c83---zevegilerife.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/bomutipebaji.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/6s9isu8t34oob1qr167ben6v40/fadosuvivinawozeve.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/0dc2747fb0ded96df68dd39ac369f6d8/wiputejisemaz.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/d574430dcc57a093d57a70fc71cafcd8/49518637393.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/lesezazovobomolo.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_off0000d31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31B 16460 bytes
SHA-256: bdd829877f10574ef44ccc8b6bafccac85ff76aa24d50ffe88b42f94570108b3
font_01_sfnt_off0000fda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA8 10764 bytes
SHA-256: 2b3b9db8084664993811821389e257f184851dde9ce9b44bb2064057ad2da4ab
font_02_sfnt_off0001162a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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