Malicious PDF — malware analysis report

Static analysis result for SHA-256 11afd24ddd540376…

MALICIOUS

PDF

163.9 KB Created: 2021-07-22 01:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e2d463fbebdb9cc821fbd3e526e687b1 SHA-1: b70c84de76d66b24ab1b8d0f768988d020e2a145 SHA-256: 11afd24ddd540376dbf358c9580edf2b76137cd627156a84ac34d31351bd6555
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The embedded URLs, despite some being marked as benign, contribute to the overall pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/d5b0d82b8fa718fbdfe2797d093971dd/duzuxogekirewijuwubeg.pdf In PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784fab036a0---vajeboxuximow.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/88i4akaa15vquqb6smbo17tta5/98938579055.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16079108c24216---nevakerusizosaxa.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/d8e6dca130dca03e4306d446546d7e53/99372238212.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/61118519010.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bcaa165ca---2720073690.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/63974556751.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/1q9hse7f5417cm0lvekgb18pb3/tirojitoguvakuxe.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a09da81db41c8128f607c9f161b3161f/vikab.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/6b7a925a2a93fba53c52800eb26b8b78/zofaraloke.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/soxupasadawaxatoguvorifo.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/lasuvaj.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ad54379f2---jifodusuxan.pdfIn PDF document text
    • https://windsbs.biz/files/file/tenamawefaparukofawapu.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/48102698169.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160acecdd5396b---kitujopil.pdfIn PDF document text
    • https://csodamalom.hu/files/files/20725476279.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ng157s4hi52l18gd100uh8bk47/mojibibokoropopugapogi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9b7f476a267eba314c09ac713b7d3311/79999496601.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16090d6e353942---sipivaros.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfff0fb7ea3---13180906513.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/dimemixefun.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c184d107c---28970197112.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/pofivederefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=analysis+of+biological+networks+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/1.0In 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_off00021c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C59 11208 bytes
SHA-256: 264a66b18f3fb58ba55929bbdf6acf5cc669b37e32104e6f5b8fe5349422c587
font_01_sfnt_off00023674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23674 19600 bytes
SHA-256: beef8dfd428f83a81ab6d2308cb0e62b90feaf4fd497447705d84a358304a7e1
font_02_sfnt_off00026a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26A63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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