Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b1d073632ed57f…

MALICIOUS

PDF

94.3 KB Created: 2021-07-20 08:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4a2fe3572f1d3a14a5037f3c8c8dd916 SHA-1: c53cf27914d49b5926e1c9ccf0562cab5168335b SHA-256: 51b1d073632ed57f1c567aa6a3ea075fe06ff4a738a65967b8a7a7ae5ccf218e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://aljuboori.com/userfiles/files/31190826691.pdf In PDF document text
    • http://szguilong.com/userfiles/files/muzalefuwoveliwuvevabarut.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/lfcq7k5phcbntmak5gfpg8atm4/gezozunal.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ffa235a82---fotolasowavivinuj.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/598ece697283d2bc06f5037467f1a3fb/jaxexibubixijifabaxizaxo.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/limagogatosiwopuperega.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/3716294648.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/kotugavizimimewufejibiv.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/jipedepozuwugunarajef.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/59909268472.pdfIn PDF document text
    • http://andrewsexes.org/clients/867461/File/93456719917.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0304e6dfd---72329878761.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083caea65faa---fetuvobenixuk.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/86987202749.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc892877d4---ravetejikux.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e94a93c217145fae6641c016a838cb2c/41494941424.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/wenokukegimikuzojamexufa.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/12808044110.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/6a15d5ac6672303f31dd9a0d1bf9711c/32084881858.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/94826909227.pdfIn PDF document text
    • https://luminex.pl/upload/file/lodarorilubovajilifip.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/33969885134.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/69536250645.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/a7f52ea542c84a555bb3a31376ef9061/lejotogepewefafopigunux.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/36934909089.pdfIn PDF document text
    • https://artbynela.com/uploads/file/zakutewefeli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=homemade+protein+wafflesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 10736 bytes
SHA-256: 0c6615dec114ffa1c602016293d0a30b50858e8074b3770091c13567bc7721c4
font_01_sfnt_off0001107e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107E 17268 bytes
SHA-256: 4b59aaaa46ec9cbf765beefacc0c217903c0fb97648cf58ec5c84465f1373a34
font_02_sfnt_off00013dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC1 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00015306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15306 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1