Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4018ab7c6635454…

MALICIOUS

PDF

85.6 KB Created: 2021-08-28 11:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 54938a361196488903b3047b1908afad SHA-1: c5ceafa2e14ef0c259f09973b28969282205db6d SHA-256: d4018ab7c66354545978f52e720f3bbd3acc104e82a881350fe8820e9291913d
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be hosted on compromised CMS platforms or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://ebooksweb.net/files/file/5503406603.pdf In PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9d94ceb69---javuwasakofi.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/jogododavesubojuta.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad1c3218dd---nivuropor.pdfIn PDF document text
    • http://ddmlife.com/ckupload/files/46395525091.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/dro4h57lfss1s158lok43d4b7n/98074441176.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f65743aa6fa---tufetununozonunupewirako.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/9149325779.pdfIn PDF document text
    • http://builderall.info/userfiles/file/lexumebaribetawuxoruzanul.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/ff8b7679ca75b81f449c84779fca2d21/pibodobimujikupupokojol.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ih3ku1ibcavf4qjljoo66rjvh6/zipobezufawanuvumikune.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/lajewidiw.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/96843554959.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59f5f3177a---pozowi.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/lifatabadevufozibedewe.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce0ec91bb9---xitakip.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/67974928996.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/bosujus.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/xusomovekupez.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/4fb9b7966ecc2bf3d34cda3ee5937187/pazapel.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/74850847430.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/watodofoxegidigewiku.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5e872e1be---28176406591.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/61591857882.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/67169267907.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/71496996536.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/vexusedewajizumokunix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ac347e6704---tozutugoneg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=naughts+and+crosses+game+onlinePDF 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_off0000e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 17648 bytes
SHA-256: 78cb3d1d8352b377873be80e0fd0d28fba19ae7e3c3815707e452b8dadc421a1
font_01_sfnt_off0001164b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164B 10896 bytes
SHA-256: 80f728edeb2a77759809a8b9bcf171328b13ce00eb8d0d19777db8779db3b4be
font_02_sfnt_off00012f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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