Malicious PDF — malware analysis report

Static analysis result for SHA-256 573b3c33b63f7c0d…

MALICIOUS

PDF

91.8 KB Created: 2021-09-07 16:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 151216a22bc889b4fe92ef480b8fcad1 SHA-1: 58c4ccf8c3bb639bcd6fec5eaf4fd703643703ed SHA-256: 573b3c33b63f7c0d00e78e9f4eea50e67005c458201056a6e98ded2c5a4e37a1
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious or compromised content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://maasmartcity.com/userfiles/file/nataratugopodirumisag.pdf In PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a04f8e4fb3---61259760256.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/32311858505.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0255cfc60---98615677483.pdfIn PDF document text
    • http://kokomo1986.com/clients/31029/File/85844539592.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abd9280e8be---67156902652.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/27562798493.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/lolibojoxajuguvo.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/35542796891.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/d69262e6bb7c95a4a35c9a3c37feb3aa/87526561191.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fad7a0c296---8497685621.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b0d6c2a13d58bf840b2d0f277acaa9bb/tupogi.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/kosometidewizixif.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ba2d28e4a---48101604689.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e41c80bbf---66013628567.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/60a942c30a3b47c30967df05a2eb141d/23670890564.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3e6919dd8a7748b8ac0571863f1a857a/91236106987.pdfIn PDF document text
    • https://banghenails.com/upload/file/tesefibesetuzof.pdfIn PDF document text
    • https://soechi.id/userfiles/file/48547514342.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/1915252108.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/6429127500.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/fibobokabuligal.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160992de7227d7---47536392328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=saeco+odea+espresso+machine+manualPDF 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_off0000fe28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001163f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163F 10856 bytes
SHA-256: c72d3f7b944a337905c240bf1948312cded228fed6a8f64a7bae09e2de4bbbaf
font_02_sfnt_off00012efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFB 19576 bytes
SHA-256: 5391fa439ededa98d239da1d6267aae5684abd4d7d35c15fb4b657c1dff4b745