Malicious PDF — malware analysis report

Static analysis result for SHA-256 823d644388a83921…

MALICIOUS

PDF

88.7 KB Created: 2021-08-14 08:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1901aa161f01681a0dd7fe138dbdd8df SHA-1: a189f969ce3b802bc4e1d35c3199839b79426dfe SHA-256: 823d644388a8392176e4bebaec400d9761ce65f2a960e473cf874950fcff85a9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress uploads and other disposable hosting, suggesting a link farm designed to redirect users. The embedded URLs likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crysiq.ru/uplcv?utm_term=rccg+sunday+school+teacher%27s+manual+2020+pdf PDF link annotation
    • http://brilspa.ro/userfiles/file///91659118522.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/makepizunepu.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/76185229734.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a45b66cf3a---68474611305.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/16075007071.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/fijivowidejas.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/18768469393.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708f039bf23---83060714654.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/81533994868.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f29af890e0---81709014561.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/62852129454.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929cf245b4b---28011253683.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f019ddb6ee---35592251685.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/26370546929.pdfIn PDF document text
    • http://scro.ru/pic/file/65922282354.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b7ce2f9e---73036053217.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607328ccb8d37---66455258675.pdfIn PDF document text
    • https://tonitomov.com/picture/file/gumuveseditumisujojiso.pdfIn PDF document text
    • https://filetorme.com/upload/files/rajotedelolo.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/jetelanubitulogup.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16077b7cc0e0dc---lapodonudokuzewitaturi.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25100904809.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ltusg4b8b54p4gt3amc2mbv1ej/nokugepepemav.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a7de6279270---dutupibipupenupemu.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609825cbe16ad---vogegiwomofalaxa.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_off0000f2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD5 11508 bytes
SHA-256: 82d2c2d7add896dd23f212caa5de30749fd4e4016968dd340fa021d761626d67
font_02_sfnt_off000125da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DA 18384 bytes
SHA-256: 3c4d27de75f70ccece368a04a4f8c2bcb2ff7dd2e64f45e1d0288fc6ccc3777b

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