Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3fdf4850a4f14f3…

MALICIOUS

PDF

85.5 KB Created: 2021-09-06 12:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d9a926c1baba4a5b4f1733017a7d92b2 SHA-1: 460c28da04495087edd783ad1cfc84c6f7058d6f SHA-256: e3fdf4850a4f14f3e5b9df2a272c1e415435ee370973fce78b6979e507bb9484
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=sony+a6000+manual+mode PDF link annotation
    • http://files.ibiza-ferien.de/file/nexoripanimofezozojep.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/21961052685.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6af1d6461---42197297662.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/60460108288.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a333267dd9d---gawipetuj.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/36mvi0b6otujh4cli2hr46g3a7/runusamudivugikegope.pdfIn PDF document text
    • http://pattonbrayboy.com/clients/8/84/8444fd18e659e4cf0f5d78ff5dcadce3/File/37834972942.pdfIn PDF document text
    • https://biocoils.com/img/file/ripetopisokeludonatu.pdfIn PDF document text
    • https://grouptm2.com/contents//files/mijevobufoxakutuvan.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ae433b72bf722d984d47414ac1d07b90/8625028519.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/43511deb6905bb40f93fb57d70bd5a6e/zafitasiwawe.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/908763528.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021051713381417.pdfIn PDF document text
    • https://eguiders.com/uploads/defiliwon.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/pafep.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/mezebejaxanaxinesinuva.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/mujigexasokopukoviluzipo.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f575de247e---33680028358.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/33273652009.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160780e03dd893---17030332321.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/33264230898.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/70559108503.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/wekewirugibufig.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/62910c1c58a4b90e4f3afdc1ba5fda76/91470050689.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160be3bd3db1af---miviz.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_off0000e9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 18128 bytes
SHA-256: 399adea425c3bc80a87cd638accf854ce2f46639a7d5446b6ed71d7672bc822f
font_01_sfnt_off000118c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C3 10532 bytes
SHA-256: e9d626a9c10d9aef8f2913c0f49800204b8efa87b7cc415ce08892e46a26a4f5
font_02_sfnt_off000130c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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