Malicious PDF — malware analysis report

Static analysis result for SHA-256 16935777cd3b89e6…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 04:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6357e0a8e6034ccf833f1d2cb5ae606e SHA-1: a0a44a50c17d034fb65541a852a3d7e5d0338d5c SHA-256: 16935777cd3b89e6d9417f5526238f290c196bb3531a4160ec7b9a9f423ed046
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document's structure and numerous external links indicate an attempt to lure users into clicking potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=tidal+power+generation+system+pdf PDF link annotation
    • https://vibanghanoi.com/uploads/files/2645854649.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16099861733445---kapilidisopepapala.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b384b066a---togema.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/35597888504.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad8a81d2a6---11446728796.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/tinuvakabajiwuxobufug.pdfIn PDF document text
    • https://fivetc.net/uploads/files/23889713558.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/texijopewovolisinilenir.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/745c065b2accd7c3c016255703bfc6b4/59019545751.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/relafuze.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/37731091171.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160743e18b6b9f---40867993604.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/8653421841.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc8181a238---37097137130.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/mewowofixaganorekaseres.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/6d26dljef2bai9k0tjm4jjs7qb/momurire.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/10261165493.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe2f79063c---ruxedilenosujurup.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607051cb41926---40299445735.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/pijipabafupojimowazolu.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f439e04e15---vewipovegolelesekuporekot.pdfIn PDF document text
    • https://bauarch.bg/files/zijugese.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/24605307355.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/porin.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/duwazujij.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_off0000dd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 17488 bytes
SHA-256: 1e4b3349529f3b19bff6be93f391571a48f812f50379c68e5eccccecb0fc2918
font_02_sfnt_off00012258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12258 11004 bytes
SHA-256: 4507d02796fc2606f7562908469b3b7cf07925fd7bd326f16756d777588245af

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