Malicious PDF — malware analysis report

Static analysis result for SHA-256 54cb10a73fb38a57…

MALICIOUS

PDF

88.2 KB Created: 2021-09-02 15:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0b54347f30b01e715c98d6b3763f5d65 SHA-1: 68f6e8d23422b69fc8099b9ec24b89e0280f874f SHA-256: 54cb10a73fb38a57b61364d336e7aca389eb2d4467dfec91f4608ae25326f2fc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URIs and is structured as a link farm, with many links pointing to compromised WordPress sites. The primary purpose appears to be directing users to malicious external websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://chcial.ru/uplcv?utm_term=quran+para+no+14+pdf PDF link annotation
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80335e52e3---70165962734.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a5d8790b---kewojijudakatapexevoj.pdfIn PDF document text
    • https://aildf.in/userfiles/file/2486382916.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/dufadofuvemet.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/95317707223.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609119486f727---pabam.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084679532c32---nomito.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210727134849.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/89172246c4b7fc6e778abd3146143e34/65713883122.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/p7skhmpr9djvaveo3uag6g1os1/mexomijowasemuxurifupa.pdfIn PDF document text
    • https://austarpharma.com/upload/files/88254544289.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/pudepunuluse.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/miraz.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160710ad92c8ac---kamebosaborezetopuzetagex.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/sunoropukaki.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/vunozezurogejewu.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/87570480740.pdfIn PDF document text
    • http://topstec.com/d/files/52593951997.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/jimusudopizewutabixibigaf.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/19102879100.pdfIn PDF document text
    • https://zold-kommando.hu/files/21749901393.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/juzuvijuguwi.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_off0000e8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D3 10244 bytes
SHA-256: 71ccfe8962ae3df45737bf771c698ca03e24bf4c02fc6b0b7e95a862d8e94ae7
font_01_sfnt_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 22680 bytes
SHA-256: 0482c46b1b7a4f3d7c8b7085cb8b597ac0d7e0d72ade6d989931a927992f99ed
font_02_sfnt_off00013ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.