Malicious PDF — malware analysis report

Static analysis result for SHA-256 471942c0e3f46062…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 11:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 47d2771bdb2efeaaab3624eed7d6413e SHA-1: 18d2a3423722fa84837ab7bb58de87d3ee660bcb SHA-256: 471942c0e3f46062a85440a567008ae000eb30a9b30ef7b64f754b975afdbdc6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs, such as http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a1e19ffb5---sukowigetolurukosi.pdf, are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://robwalker.net/fckupload/file/43910369470.pdf In PDF document text
    • http://theponghop.com/upload/files/83585399114.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/jekivujuwijesowu.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/vavolujowubikirogepo.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/sifepufobamiwafulef.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/zegenesi.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/runuzotanowiwufel.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/rogajedifewonenepidag.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/fisemurifokokodujisu.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/xiwololokon.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/99afc260bbe4d2053d6fc72683cd2d57/37415291472.pdfIn PDF document text
    • http://talesma.com/E/file/53022363534.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/09e3f08518fd29108cac5eafafd6d57e/5758065691.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141636258635---zilirag.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/89602116080.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/tokidotowu.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/vatuxadafaxeposux.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a1e19ffb5---sukowigetolurukosi.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/73627119247.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/xuxenonijatinoxavisimut.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/25619170478.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/53639656807.pdfIn PDF document text
    • https://wrd13.com/force/file/53747853828.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/xowewul.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/pajurazalaxakavatafud.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/5157120659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=mx+player+video+apkPDF 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_off0000dbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD6 10380 bytes
SHA-256: 97aca85090c7f5cf49fd5ace0e4159f571d01731c430466d3ea4f7d41e0f2b72
font_01_sfnt_off0000f371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF371 18708 bytes
SHA-256: 75e08a46402f690abe140162d14aa7d92823dfa9d99187fd2970ce77f2ea73bb
font_02_sfnt_off000123cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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