Malicious PDF — malware analysis report

Static analysis result for SHA-256 73924240d3c835ed…

MALICIOUS

PDF

78.6 KB Created: 2021-10-07 12:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 001a84a1a38de5b576d1d38e7a22ceb7 SHA-1: 2631bf2f08f6223be4eccd0af0273a83f7e96d83 SHA-256: 73924240d3c835ed55a4c31c3c8808a27393295a63217d2729ae2b0f04111990
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised websites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://bojovesporty.cz/userfiles/file/7976438399.pdf In PDF document text
    • https://mogilew.ru/userfiles/file/rilebezodexowiwimo.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/19557943278.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1615c028931cba---pemuxewarukemiguviw.pdfIn PDF document text
    • http://crediramasrl.it/public/file/58334961403.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/vediketavov.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/12260905194.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/10468699238.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcc11cdab0---56861036836.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/2084952ecc5fd9ae9b6f88a8c729b7d9/71067263972.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/99204254426.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/dakanobikosamipapude.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/35856600984.pdfIn PDF document text
    • https://kildevangen.dk/files/40607790724.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/52110627627.pdfIn PDF document text
    • https://ana-jsc.com/upload/files/belinapuzovovibovam.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/pirajolejunusaf.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/9b51c28be93f9dcfa5cd6952ff5b0a91/tewokopumufofukif.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/rotigiputise.pdfIn PDF document text
    • https://casaalu.com/luutru/files/12161087938.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/5vumlim9j42ncv5hl3mm2ccdg2/lijeloruzulinazotep.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/dowevobutos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=dragons+in+storm+king%27s+thunderPDF 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_off0000c9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A1 10876 bytes
SHA-256: 327be1f7f18a6273cc2b6c2c065b491ded7c1ba5a97c71dabcd4247b5bc09f19
font_01_sfnt_off0000e266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE266 19436 bytes
SHA-256: 9f1289fb9653a6819e213eb1e858fcdd0ab2780f85414ff0a6aa017d2d8b67fc
font_02_sfnt_off0001144a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1