Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cca1ef8d6a9d178…

MALICIOUS

PDF

85.6 KB Created: 2021-09-04 10:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 14190eb8a75a16b51cd511781a66732e SHA-1: a34af8570028c42e7b3511a5a35aea97b0918cee SHA-256: 3cca1ef8d6a9d17857fd70bab75f47f2da7bf8d4dbe5d236bdb72786bf908f64
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://chcial.ru/uplcv?utm_term=lidocaina+com+vaso+bula+pdf PDF link annotation
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/123cbdfafb5e822d1f2ba1eea5337265/gefepufegozuvupipolofukep.pdfIn PDF document text
    • https://seerupit.dk/assens/file/61372700685.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/53802772224.pdfIn PDF document text
    • http://dakmet.pl/upload/lodewuvo.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/14293793396.pdfIn PDF document text
    • http://starke.ca/clients/84205/File/84181865239.pdfIn PDF document text
    • http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/winalow.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/d684dc520e8836955beb1c53c34c6b35/88297835184.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/98292099082.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/4f771b263683092fe2d101ec5aed5585/weloviwazokiseromoz.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202108310035522929.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/97455963529.pdfIn PDF document text
    • http://poorclarescork.ie/images/39379952917.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/turexi.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/93211100325.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/48284736254.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e83a9064d7b---90730558688.pdfIn PDF document text
    • http://sparkpro.lv/content/file/77188067648.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fb21ab6d6---mezufu.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a06aab449---45073352091.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087aec76e49d---datisojetiziri.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121838c20c72---32207355940.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/jekimeb.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/o3ikplbv6pbch0g4ckseftkbki/xufodekimekepenezak.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/xopupabufefadibibaf.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16080a100605fd---89997399775.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_off0000e4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AE 19796 bytes
SHA-256: 0901874f4320f6947d575c73d3b377a342371931d094ec1de6f567d5ae5aac10
font_01_sfnt_off000117dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DD 10712 bytes
SHA-256: 191cca644d4d44513e4ee8881b15654fbea87b44a51b608cb6103f3f13d7c070
font_02_sfnt_off00013027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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