Malicious PDF — malware analysis report

Static analysis result for SHA-256 28397f65b108eb84…

MALICIOUS

PDF

87.2 KB Created: 2021-07-14 02:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cd30368ff7f4e2454da45ca0b5ba7e69 SHA-1: aefcf36943329fc6c9e441224f845ae68879ada3 SHA-256: 28397f65b108eb849028702b527427f87a526c125d65b69aad2cb4db46466a5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection for phishing and trojan activity. It contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the nature of the link farm and the detection results indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://daiichigroup.net/uploads/news_file/69228324184.pdf In PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/653c78ade2d1fd351f366f925224d266/41325693022.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/9efde4a1edbafedca53e8466e1ccb958/12228735493.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ea73b763a---95744729274.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7a77233ab---98423735484.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/00753328cc34769f215223155a21bbd4/12099396450.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/xibojazajatak.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/87db998cc1561ac6bdb335639da17016/bipakegowukesilowelopon.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/53d213dca8a83159656c46062f4edd01/tapuwovagu.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab90db31c---95689756611.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/15816168710.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/02/file/20210702_204135_174.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/7dlfgoi1enq31d89dhvhofseht/41449494103.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/27322034124.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c52a9055dc561af873cec412c9892c6f/giwisevoronenokefuguxo.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/19914084704.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/womowukolekitewaxaru.pdfIn PDF document text
    • http://fedoro.ru/upload/file/79374705602.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dab29a2c7---48510301196.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/zisuvoxusej.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdecb1ec9e---31059652588.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/xeridipadebu.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/f743a2c8d316e71c67caad2a119879c5/zepefizapitolufobol.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f379ae2492---nugobok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=hypernatremia+treatment+at+homePDF link annotation
    • 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_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 10408 bytes
SHA-256: 1477f920699ca1cd6769866dc43659e55cf02d1372ef34067a52c90c932a3519
font_01_sfnt_off000108a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A7 17928 bytes
SHA-256: 82bd26f150baa0c6113cba159240ef9be5042626883f8cd99a49423443d73c70
font_02_sfnt_off000137ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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