Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91ae9da1091036a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 20:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 473cb3478df0260083d4225353ade7a6 SHA-1: e21861832943b3ed41a5d749467ee87732d60c66 SHA-256: e91ae9da1091036a2a1fc05fb4e00b047ec8728d861121b6b5be20d2c03325ef
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=how+to+stop+auto+spell+on+android PDF link annotation
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137459d78c90---boras.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/45566669325.pdfIn PDF document text
    • http://cycling-software.com/files/file/22714262690.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/runekutelewo.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161332903f2e72---kiruzasevosife.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/roregumutasamujibuvipam.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/vubawumitoresufuf.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1b9053a6b3ab238950517c6ee42fc38b/nivuropowozok.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090320440488.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/nebubonawotiwofewi.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/79592274739.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/69888677849.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/27158103673.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/b7dceb8862f0464cf9d8ce3c79f939c2/91236259755.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/33utmkhtt1r2cs1l3uu95odqi3/20396392069.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/vagagajigixizufedovag.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7b602f2f1---raxagepixilivotarewutojo.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/gazijut.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/pudefesi.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/1760952646.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/26713348381.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/zonafovozez.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/tixafizuv.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/xamepevegalewumefutelawew.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/riruxut.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_off0000dd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 10564 bytes
SHA-256: abea0447ab9dbf448419c58e0e808cc279cd89551c2ded24d70f148e66cd6f5f
font_02_sfnt_off00010d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4F 17736 bytes
SHA-256: 1debb2e3643a2c26d3709e8285c159560930ddb5fbed55e3a944d0649d676e8f

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