Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73efd1ef2efa111…

MALICIOUS

PDF

92.3 KB Created: 2021-09-07 17:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8a9c300b437cd7eac3aabfe61c6cecef SHA-1: 841ad7b9eb318b82bafc4d500fd3c146b8bb3689 SHA-256: e73efd1ef2efa111da1f2d0a3c4d2d27285cfda4993a5440d15c08471bcfdb96
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://phuocthuan.vn/images/pic/file/fuwipabez.pdf In PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160950b45cd63d---44003091860.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c36e552dce5---kuwusifipozuwajuxiroji.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/luguxadumovemed.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/naduluwusazujosurezenome.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/wopegumupozebe.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/07802ec8a654f57b73b940401103f7b5/zofifo.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/gukotogesosisobitaxinuvap.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/reketuzaba.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/dodesijagijalowuwilaluke.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/pupelonofajamemipesejev.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/wejatojujusewenugiliw.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/76205086114.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113abb2116af---wisipamudaxu.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/90226612947.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/wexaxaturugaremexeropimis.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/10206783306.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/95363355385.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/0d9aad9878c1ae963963e1efba696c1a/82220994136.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609628298b0e1---31086718716.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/xujux.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/aa309ae97dc789d06bed6a2d3f2d93f7/faxokonetikupogaxe.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/52772250a5ba7285213910dcbbddf754/xafajatideze.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077071165ab4---69769951442.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/kukejalujivezuxofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=june+current+affairs+pdf+bankers+addaPDF 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_off000101bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D2 10768 bytes
SHA-256: 2d1e258ba4fba1eaca60f8c2b607a57a894ae8be150414b862d27c7b6d385c3c
font_02_sfnt_off00013287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13287 18688 bytes
SHA-256: ae1958f87b3500916d807d93a66bf38272ddbe7d95e11f0a62e26bdcdce4d97d

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