Malicious PDF — malware analysis report

Static analysis result for SHA-256 d359ce0df9f7a6f0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-21 18:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f0accd570b828d6447f7b57ff7288578 SHA-1: c0cffb2a6eb8a90c90b8b31a67d9364ae3ef3c29 SHA-256: d359ce0df9f7a6f08fe385ae4054adeebff7d2b613aeeff9274f91a6a6be5a88
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137d859c0c64---36576941901.pdf In PDF document text
    • https://mygrind.ie/userfiles/file/xufukulig.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/68845221195.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/31246681265.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/milujifakeko.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/9167801017.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/tuvejefovadetenubana.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/vezazenerozupilukilopiter.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///gibatubisekogutunato.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/78819259086.pdfIn PDF document text
    • http://grancanariacomercio.com/documentos/file/balenobamitotosodubupeja.pdfIn PDF document text
    • http://imprezka.2kc.pl/Upload/file/44458470285.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130bb40d7dd5---90606919105.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/xibenow.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210921005124067.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/muguj.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/perelilexiwojaxirisobo.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/fulefibalatetibisek.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/wolelilaludozeregexu.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/kigakukasemakamusezag.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/zuzesobajitagubapi.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/pafemolajokux.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/21302937377.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/dirubolojanuxukuziwo.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/jereveremu.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614769ce53c2e---kulazosawunuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=minecraft+pocket+edition+game+free+to+playPDF 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_off0000dafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFB 17008 bytes
SHA-256: fa0311761c540ed981b4d802d86662eef886f19cfd23e8870ead1a86a9a80369
font_01_sfnt_off000106e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E3 10992 bytes
SHA-256: 1e8a4f105a0998c00daf7e7e6781d1e967fd831c6745c38cb64aa99bdbe47a88
font_02_sfnt_off0001203a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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