Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a162ebc4b74332…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 18:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4bc4bda7ebce516511b25513f2b9cc8c SHA-1: b4d4559c0cac204229160edb3bc6555c17f3bb1f SHA-256: 18a162ebc4b74332981b123a62e47ff018961ba70564fa56b43f9d7f467b3f2a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, potentially exploiting them via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://philabc.ru/uplcv?utm_term=wattpad+app+download+free PDF link annotation
    • http://skonasystems.com/userfiles/file/fejinubuf.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210913035349.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16135ea3626701---mevaju.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/41125423824.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/sanikawomosatekogorituma.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/15665344721.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/84385554412.pdfIn PDF document text
    • https://media-get.com/userfiles/files/wabajisimiwidofovub.pdfIn PDF document text
    • https://tigaintan.com/contents/files/faboz.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/38082307914.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415cb9a432d---44499143465.pdfIn PDF document text
    • https://sanidom.pl/img/file/vibodawu.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/hdverg114db9ul58d4fp39m1fl/gukerafibivonimibeba.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/10c08ca254031accbed90bc58fdf2071/mugegusedewuridugemu.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/kekisesuri.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614655acd917c---totazijafofan.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/sunoriwiso.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/busulekebuge.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210918094600.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/kexurinibulikogiralekeluz.pdfIn PDF document text
    • http://villkasz.hu/editor_up/podavera.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9ce0f4a81c25fcfb70df1785179c38ff/15373958163.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_off0000e0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C1 10312 bytes
SHA-256: fd9e0290d6c7e97f485b4df1beb67bd9367f113c931cf27dc4efc1b515aaab4a
font_01_sfnt_off0000f821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF821 18448 bytes
SHA-256: 1d4660f519b3296788431e95b40ad5e79ebec1f2034ba3d90160fe303eeea223
font_02_sfnt_off00012804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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