Malicious PDF — malware analysis report

Static analysis result for SHA-256 330e50acafba35c2…

MALICIOUS

PDF

75.4 KB Created: 2021-09-08 14:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be031941a6ec120a1d7ef270304ead57 SHA-1: a2322666231da6701d1a9849f49c3cd896f6f492 SHA-256: 330e50acafba35c2dcdd878791ccb67248593db01bc32e71d9096ff03cdc1ae2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous URLs and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://zerling.eu/nico/images/files/16663018349.pdf In PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/958323936.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8dface28---dopixazipelusuwujuxagidez.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/revasoze.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/wulekadunixuvur.pdfIn PDF document text
    • https://mavibusiness.it/file/nodozorugize.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210908143029.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/wifodofikuzedibi.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/of7s5l8gbe945j9kkuvpmln8o9/59878488655.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/b0e9fecd7755712c7bb9128ad878b7c5/bodezedebilavisebexufoji.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/4129643580.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/8521171382.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/81456998296.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380f01c85fc---kutego.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/sonirexiw.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/divor.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/43746428727.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/18927591457.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/fonufivosepaluloxifugegik.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/75473022850.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/gemixuwotetudopetuwu.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/77760848510.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306e3575e52---lemogeperulin.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/tugizigofotogipavorivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=medical+progress+notes+template+pdfPDF 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_off0000c2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B3 10956 bytes
SHA-256: 6c1592f12e810cc1c13ebe41b7795bd27a22e8b3e763703abc3bc7d8231f5859
font_01_sfnt_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 17004 bytes
SHA-256: 36483662590b8b5b5b1d02ac2224040721ac1af88e3143f61fb9dcfd572877ca
font_02_sfnt_off000107b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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