Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a1c1e2db7d9fb4…

MALICIOUS

PDF

79.7 KB Created: 2021-09-15 13:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 708f1da6e563c4ced21432835f7b5a2e SHA-1: 2f10b0ff5e4927faa2afc49da34fe99aba47aa08 SHA-256: 72a1c1e2db7d9fb41c5ae324ee6a1b944a23471bfae4dbfea5aa97b4946a11bd
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised CMS platforms or disposable domains. The primary purpose appears to be directing users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://irlanc.ru/uplcv?utm_term=how+to+make+an+android+app+with+java PDF link annotation
    • http://galaxyjewel.cn/uploadfile/files/89353197914.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/vonatigenul.pdfIn PDF document text
    • http://banquat.com/userfiles/files/gixetumozokidamiwudetetox.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/27465228950.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/dutusatejotabezudisigabo.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/50713435129.pdfIn PDF document text
    • https://wittnebel.dk/file/kigekibanexiporusow.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/buxizugo.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/vatinidenugikazarepom.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/fowupekikosumipuli.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/kesusewajeginajurazidu.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161410f90855a5---44678376440.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/42723716023.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/fukixafukenilifot.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333b9a97ca6---29729609090.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/menutemukexikopo.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/towig.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c60e94721---najukiwuj.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/korutivo.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/tunibepufebawupiw.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///46176361769.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/legibabovur.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/9591707897.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/0c7a33155813980e0263ed7d3676fa48/89454593753.pdfIn PDF document text
    • 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_off0000d4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AC 10808 bytes
SHA-256: ebe419645726bcf40061bfc72d73cb22ba346e79fa4dada52c088160c227993b
font_01_sfnt_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 17120 bytes
SHA-256: 52394cbf1d58f029d1cc83f4461252fcf7e456652b4ee6449193dea1fde50245
font_02_sfnt_off0001196e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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