Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a800cea563fcaec…

MALICIOUS

PDF

68.5 KB Created: 2021-09-14 03:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f5c6e4063dcbd9fd747b844907d716f SHA-1: 4d3545b48e0eca11620849557e901b8029a739cc SHA-256: 3a800cea563fcaece01b32e2cbb61ab4e8ca77f7465c9237deff553a2b224b90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Some of these links point to compromised CMS upload directories, suggesting a potential phishing or malware distribution vector. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://penal-garazh.ru/files/luwujojesudiwajowasu.pdf In PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/xexejotiwalojira.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210902_F2CA08A0CF443E0E.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/46862548042.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/biwiretavejuno.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/8444324818.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/98052500706.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/36224692982.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/49976190627.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134f8e3a998a---38185844118.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/bimiforuxuwun.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecbda8dd8b---gizesaf.pdfIn PDF document text
    • http://gojjang.com/uploads/files/gelareb.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/82475748090.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/fugisibix.pdfIn PDF document text
    • http://fxmeat.com/upload/file/e7d22a07217ee781d61be5adf039d06a.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/53804285344.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/xamadejuvudefivokuwez.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/c385e2dbcedabf9c41d4a8e3d732cad6/58715531952.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/jukivixoxirejugekanelitep.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/81336742726.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/74277317847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=p+words+in+spanishPDF 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_off0000aeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB7 15416 bytes
SHA-256: 2b295453e1fdd311cc8575dca1f9ae74dcb340fdd41872078ee7d2659abbfd63
font_01_sfnt_off0000d5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 10300 bytes
SHA-256: 0721e8f2cd908ad6d27db2b05937fcbac716024c85ffbc8081f42d8d92e9e742