Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65ccf2385cbe8b6…

MALICIOUS

PDF

73.4 KB Created: 2021-09-16 06:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a37d915dbbf573ac3e550c6714f9bdad SHA-1: cb16d571d7d4ed0e0961feea61a1c33b4547f9e5 SHA-256: a65ccf2385cbe8b66dc778332ef3ecf51d2f9ef9c64bc6b1ac1138aa27612bc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are typical of a malicious PDF used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://oniceh.ru/uplcv?utm_term=round+image+android PDF link annotation
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/73s4elgn07fcf17m5vsm0avmk3/11402289032.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/92179476764.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/92084509910.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/r397l32q0rqn4fsbm7g101ae4f/tibuxeroxomubidab.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/92577219408.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b90c0a0e9---66349364847.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/33635051865.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210904_70F6D396F65288EA.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/noguraxisodegili.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210916_18CA3FD6521320C2.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/folapevupiriputiz.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613eea3155065---fasitesilezugofefepemefu.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/javukosefagajomok.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/95527601183.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/51697758302.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/gojokajixugisekuli.pdfIn PDF document text
    • http://evola.it/userfiles/files/daxowujifejepalowinava.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/8870870012.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/91338690412.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/mupojuxalivowekuxewiled.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/dusumolexabokojameporoja.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/pitifojutumivozuduger.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/74252654753.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_off0000bd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD60 17240 bytes
SHA-256: 7d08fe882bae864eee0b3e1a00e832c4e13cac601ee96deb4a65c14c51d2a5be
font_01_sfnt_off0000ea42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA42 10424 bytes
SHA-256: df52e829ced2e08602c4a4980f5ba1dd93ee064dd928cac46894c1c5041869b5
font_02_sfnt_off0001019c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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