Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae98792ff0f1efc…

MALICIOUS

PDF

82.9 KB Created: 2021-08-01 11:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7cd6278402ad69d71531e08f2683519c SHA-1: e8a547fe19ccf248a23e56bd8ffc33156f99d974 SHA-256: aae98792ff0f1efcf50db06c2d27ee5a6541db48c486caf85f61823ab0a5b9dd
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable domains, indicating it functions as a link farm. This is a common tactic for phishing campaigns or distributing further malware. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the assessment of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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.
  • 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://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/7093329222e38eaf17547dd0084bba6b/jedixaxowakobalok.pdf In PDF document text
    • http://bronia.org/userfiles/file/sanapekebimar.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/6f094bb4e2b40f9ee5c438ea0e1c07cf/76625061870.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/nakigike.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/nusinusetiki.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/gofegifajorifowuzazi.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/2022728621.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fogedisixototifu.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ctmadj9oanskub3jtcoqflpec6/87491058927.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/69723232336.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/gamojapitubibapolonu.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/fibuzimifiripelidibuli.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/zipivugiwezonolalokemizut.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab54b78d412---xinurujukunom.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/96445284585.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ba5d33ffca405c40d8fe243c62a08c1/ganojatizo.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/dexuworijig.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcaf63d2e9---tuxofatiz.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/68763651960f84057df78d.pdfIn PDF document text
    • http://eventechsite.com/files/files/53556255867.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/lamuzolonudovu.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c03959ae86e---napogarulojosoduk.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/povivisijejamuti.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/53170908618.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/vafugevisavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=alternate+angles+worksheet+tesPDF 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_off0000e020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 10452 bytes
SHA-256: d8bbc8396a438f18c8db26f60afa214522fdca91a121313dee91a8c10463a19c
font_02_sfnt_off00011001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11001 17440 bytes
SHA-256: a68d28e6c64e38d04141f6bb5fa7694259cbc6648e4bb940c76697c69edf6ca0

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