Malicious PDF — malware analysis report

Static analysis result for SHA-256 87036485b5453efe…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 07:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a4da96bb1755ee769fc2a9b0d5ac3bba SHA-1: 4750404c6c9202377a99dda547e8b9628e26a1ab SHA-256: 87036485b5453efeee77a7d8f6f6ec917c289a1ef135dbc8b79a705d0c4a2bd6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicate a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, suggesting it serves primarily as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://sromedical.com/file_media/file_image/file/57916933309.pdf In PDF document text
    • http://utpcomp.ru/uploads/files/wotuxuzejufazazojovo.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130856130f34---rerozajivewazelujejeg.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/fonomapojipege.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351901310e4---duvuwilatiter.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/loxeva.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/349180964.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc61aa366f---7718343792.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/61551244544.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/dewiwozigesuma.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/bozokewaf.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/40940713469.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/lesafaduxifas.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/tamufapajator.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3bf99db86---kexujidirupawevibeloluzig.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/lapitozoxezoxonuburupag.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109020112306145.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/miwavalego.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0feddea3c---mixawez.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/59067506879.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210908061928.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/94976803800.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/19272316581.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/27076971563.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/jefusimudig.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/36455185279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=club+roblox+codesPDF 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_off0000d777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD777 18808 bytes
SHA-256: d676e1275a5c5b9a66b8dc8c1a58bd78a1f9c81a92ce6ede95ab80a4961d9a6a
font_01_sfnt_off000107fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12015 10280 bytes
SHA-256: 96709642b8e8bbe241a4a45bec8455b41806ab744d63dea154b02f24076d7d88

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