Malicious PDF — malware analysis report

Static analysis result for SHA-256 54cb93dc9115f81f…

MALICIOUS

PDF

87.2 KB Created: 2021-09-01 18:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9927ff4f7ad71c0223e7ca69d2f0a596 SHA-1: bcae8f49496af5529273d57222da04faca60ea39 SHA-256: 54cb93dc9115f81ffdc46a01893390edd4527ab3ba44fa95ad232f38f0443059
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on potentially compromised or disposable domains, indicating a link farm or redirection strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mientrungland.net/uploads/image/files/xonokebipenawa.pdf In PDF document text
    • https://newtech-utm.pl/userfiles/file/43710325802.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/211701161580.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/95f840a81e0240e7df052af341689aa0/19869753284.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/33355298183.pdfIn PDF document text
    • http://fitviewer.biz/files/file/dikadoratikozekovekenux.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/lowezarapaxadanatuxe.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/segetexidivuvan.pdfIn PDF document text
    • http://labsshop.com/d/files/dinutanedolutob.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/faxudekozozofakobapugefix.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210519012042.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a070c27438e---diledigaluzeref.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea097e70e0---fofowewatawoniduzo.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/51939441560.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a978042babb---99513802262.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/gojukuguletonobuxise.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/jedifoli.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/nelokufosulorebixaza.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612add9a541d6---35545209068.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/71186029723.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d3a48989de274a02ca115fe584ab25f5/74092201802.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/12746483998.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60de4b70b4---magutosubemirelabum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=interesting+questions+for+kids+with+answersPDF 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_off0000ee4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4E 17872 bytes
SHA-256: ffa9ada062ce64f873a04fb3bd0da7d857e9836c821eb15445db0f8541a88752
font_01_sfnt_off00011cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFF 10960 bytes
SHA-256: cf08cdd12e3908fda922e3cbdc56400b5cfadef0026128f5a8596d5e2c3cdb45
font_02_sfnt_off000135f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1