Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c863a28aa5f0dc…

MALICIOUS

PDF

84.7 KB Created: 2021-08-15 05:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a7b31d8970dc6a73e18e776622a23e99 SHA-1: 9d6efd033e7d2e565d43922134b1552c1d4f93d0 SHA-256: f4c863a28aa5f0dc8a4b09906d0710b158ca414bb3001f1e99325e7b53c3e1b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories, suggesting it is part of a link farm designed to host and distribute further malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and URL findings strongly suggest it is used to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=kuttyweb+movies+2019+tamil+movie+download+tamilrockers PDF link annotation
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111ed15eb452---gukake.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/sowilagife.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c567170f42---84931128046.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b42b5014379---vurimozisolotiwabam.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af89f389d4---34595364474.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/o2hrochek45k72n8sai32cn4o6/32683658849.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16114cb5e5fd39---80703272144.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/zifukovusizesijawediku.pdfIn PDF document text
    • https://naoshima-habitant.com/78351603221.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/wogix.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/33369522270.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/4811682622.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/4aec3348422e4a22d1dba3819afd70b8/lowexomowegegivur.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b510a00f914---91723469064.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076616d7872b---fepiguvubelapivotodigub.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/ruwufopabenawo.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/6fd9af748f298d091239f9a533608162/wabur.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/68983827084.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5c404724dc6840a5cd48fda014856c08/sivimelobodefusagudolov.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/pemivogix.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/7941813483.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fb3331345---kovugo.pdfIn PDF document text
    • http://matras-devison.com/upload/file/67926241291.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/8db5a56264369c0c3b51f10eb6cb83c4/46694422675.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/3519508973.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/fgsv6989arl5j286qjd02nrima/tasagekuwurumo.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_off0000e4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 16624 bytes
SHA-256: 5b3fa9262c5b7ba6fec2f0abf18a02ad2b6d815a72967243aced76187e57fcc3
font_01_sfnt_off00010fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12801 11580 bytes
SHA-256: d451f70ce587df7a5c6bf900137face52c20363ee218876c6b34f0954ac2068c

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