Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f748fc8fc1cb326…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 23:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ce3e6a4f4137eb20b989d86973fcec4f SHA-1: 8f7b6232e06f92fb2519cccef5fe3142c0c6b7ff SHA-256: 5f748fc8fc1cb32683c02789aad4e373e66a2d2348d9cc5636e1e20d279949cd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://adria-ex.com/images/blog//file/fefibujejuzulifaxalebas.pdf In PDF document text
    • http://isisthailand.org/file_media/file_image/file/87049931786.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/43367199732.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/xawevipov.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/43137473508.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/013349e51972582e07983f0c26c4bff3/xuxubopa.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e11411862---rawaresilefag.pdfIn PDF document text
    • https://groupburuemas2.com/contents//files/xuzijotarezateg.pdfIn PDF document text
    • https://blogsma.com/files/rerexesug.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160881ebf4c107---numexefopukuvazumefuj.pdfIn PDF document text
    • http://nfc.soo.jp/file/17377697802.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de2ad4ee7bd---tawonaxotoxetob.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c8c60b7ea---17729838117.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/pobotesanupezaruv.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608e77c51a2e6---83359279473.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/ramejaridik.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/80573275028.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/s939mrdv9atvo3rimhbircj2c4/kikebidoralusukanifubax.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/d883f4fa67e6514f4b725d7b6de95612/wezibaserex.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/90904328658.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/2809883072.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/mubesemoguvugimasojegumo.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/37040435787.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/wejitadiribejegesibobe.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/polemudijimamejizudejuzil.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/tuxujuzuzaka.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/gidisipigemisekovuninir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=fruit+production+book+pdfPDF 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_off0000e2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000facb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACB 10412 bytes
SHA-256: b0054114a110f6d51b03c3acc175e2d4bd83adb53dc98db135ece50976437054
font_02_sfnt_off00011231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11231 18092 bytes
SHA-256: 8c7b60e5b32a2b9198af97b4d9f319bd53d71c38e6612b513e03949553c5a3ee

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