Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37e5989d7983614…

MALICIOUS

PDF

86.2 KB Created: 2021-09-21 11:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3db126221311d5b961026cf68a6d8d73 SHA-1: 68ff179e8ef654c7b09676a4f59b46b44c98c627 SHA-256: d37e5989d79836143ca8c7bcd6fbb0b46b5536f2f6009b23e502a54dd334934f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or redirection campaign. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=supernatural+s6+e6 PDF link annotation
    • http://bahtiyardishekimi.com/fckfiles/file/tarazakonazatatokew.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/kebesafo.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/gikajoxibifijezugeg.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/85403240814.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/55936124561.pdfIn PDF document text
    • http://formacio.fic.cat/uploads/file/39618326246.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/67249436800.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/57009447289.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613328140836c---jotorupi.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/lewimibixe.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/mutil.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/d6a6aaeeea32e8c49a5c07f7dd6ca2af.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/4112240132.pdfIn PDF document text
    • http://sieuthibds.net/images/files/xipemegosipovimafo.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfe4e4f4a0---koxedowofeni.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb8847858f---60379369155.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/wetapapepixu.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/59445942685.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210901112601.pdfIn PDF document text
    • https://comfort8889.com/upload/files/51351798360.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/bitominoxazuretogukozowo.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/mawipavakiva.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_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 18660 bytes
SHA-256: 2a71419e38397e61f9d9c958dbd08260ae32161c8c56bbed044e3b0ef78e7b41
font_01_sfnt_off00011b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B89 10376 bytes
SHA-256: f03c9f7ba54fcf9d1e6b0d569f79f9d7c5bcd0d21fa91e408a7ed7b6f98f800e
font_02_sfnt_off00013329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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