Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e7dfaa6e0aa529…

MALICIOUS

PDF

82.4 KB Created: 2021-06-28 22:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fd1ca024d5f59f14f4e22a9ac57bb107 SHA-1: d2f1e4b06aab3f816231f1d02de46620e93899f0 SHA-256: 35e7dfaa6e0aa529127ccd6cc4b3ebcdb54eaf393796463ecc998f38299960a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious by ML models and ClamAV, indicating it is a phishing or trojan delivery mechanism. It contains numerous links to external PDFs hosted on compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_INVOICE_LURE' further suggests the document's content is intended to deceive users into downloading or interacting with malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://smidgel.ru/uplcv?utm_term=strike+back+meaning PDF link annotation
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/j96fk9m4dhvi5trnf1fg3sd1k0/raderujuzunij.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/c15n1nqt5aml3o6tgdi6l44bdh/sepaxijipazugo.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/372f0793650eee2980f8de88eb50fa2d/fojigemozuka.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050321363372.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b07f6890038---watido.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/92795540275.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/fezavufivid.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/fetizaxiferumiw.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cec06dccd6---vetimosemepisevukes.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160741cd1a4dde---23440750663.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/85b84cb6011411e78247dcb95f0b6a8f/temibijokumeludi.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/folubibepu.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/68f27db6dc9ac52560971f25b1b9343e/5286360625.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/kevipubivuxowarep.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/94612919227.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/69625357927.pdfIn PDF document text
    • https://highrise.pl/file/97013905256.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/a454hj7jql1adujtaq5rrq30o2/wewakaxifili.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4fcbc6d1b---tevumiteke.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d1df92dd1---lagavuzewunofebamaki.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098408e55d41---wawefavejokosug.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/9b57cbdf12cc6d83472bf6ad41df4c3f/55868987603.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dec80afd1f---dakipipulo.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/801dbbba0f99f55a87c1b6bcb30bf181/nosurojumur.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_off0000db8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 18184 bytes
SHA-256: 3e21ac4f675198080fcf4815dd63c6b86fcba0bc8a7a635e79c4862c5a88db32
font_01_sfnt_off00010ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD2 10548 bytes
SHA-256: 1f6a386bb479a1918e304f0d4270e4c1f725058900780f32e1d84431c0ade62a
font_02_sfnt_off000122e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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