Malicious PDF — malware analysis report

Static analysis result for SHA-256 b405b59603a68402…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 17:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15a10af070850f2be793fae4faed7f3f SHA-1: f098fd78ee5e3eea89c4918f3d3ab65bced444fd SHA-256: b405b59603a68402d82d2b07d1cd8a5f4140f23c7fbac66a626fffb0b4e18a4e
176 Risk Score

Malware Insights

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

The PDF document impersonates a cloud document sharing service, a common lure for phishing attacks. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://huntic.ru/uplcv?utm_term=text+message+send+failure+iphone
    • http://mabifitness.it/userfiles/files/44707899698.pdf
    • http://cnsgafgl.netsociality.com/upload/files/67984026981.pdf
    • http://3wsystems.com/shipinc/userfiles/files/33226407997.pdf
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/vafagovoviw.pdf
    • https://globalybm.com/ckfinder/userfiles/files/1631432794.pdf
    • http://denizyemek.com/images/fck_upload/file/lovajodujebategojizab.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/f4vharehns5li5qrp6f88pu373/66976463132.pdf
    • http://manpukuorder.com/uploads/files/bikebewaruwipitanenen.pdf
    • http://tingchucontrol.com/Uploadfiles/files/2632434004.pdf
    • http://dailitara.lt/bites/uploads/file/70793319983.pdf
    • http://handsonmontessoripk.com/userfiles/files/favovusut.pdf
    • http://zhouzhuanx.com/v15/Upload/file/20219151419523672.pdf
    • http://emrc.ie/upload/imagecontent/file/momefoxazewokigun.pdf
    • https://aathichudi.org/userfiles/file/1148877171.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613000725f2d4---renofevoduvategoxedi.pdf
    • http://bakineshr.az/ckfinder/userfiles/files/figipa.pdf
    • http://pacemakerpressintl.com/uploads/assets/file/fitigunokipapet.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e46ba8d086d619124f143567d515a80b/82653789353.pdf
    • http://lanaecoloridabruzzo.it/userfiles/file/23236603781.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/8892e633facb802d9a6b4e1680d22c7e/88895415285.pdf
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/39698503130.pdf
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/viwegudolevibesifapogud.pdf
    • https://stw-nowogard.pl/download/file/69302879361.pdf
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/6236373288.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC9 16792 bytes
font_01_sfnt_off0000f2db.bin
0c70bef414f81d89dd621483a2ec827b61f162bf3f8cb6378193a2361db06c81
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DB 17780 bytes
font_02_sfnt_off00012168.bin
1ea51a61ddec16b3f09626b7fa19e28fc52ee0eadd6442652b4679287faefc9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12168 11112 bytes