Malicious PDF — malware analysis report

Static analysis result for SHA-256 455e9582d3fa54bd…

MALICIOUS

PDF

86.6 KB Created: 2021-09-10 22:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5da363de8cafab74971981ada5847e9e SHA-1: d3bfc338627a7d83a6c908ba4d9e08bf94ff638a SHA-256: 455e9582d3fa54bdecd6407ebc85ad8ff2d5087845867739ddeaf8f2e5d0d0fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to various websites, one of which is hosted on compromised CMS upload storage. The heuristic 'SE_URGENCY_LURE' suggests the document may contain deceptive language to prompt immediate action. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using link farms for malicious redirection, likely to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://gs-hemeringen.de/ablage/userfiles/files/96257628445.pdf In PDF document text
    • https://episcopiaoradiei.ro/files/66779545062.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/vekuxinobomoda.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/pedebuf.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/u8ujl6iqa219nupia1nr54bdrg/635754908.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/zadidimuzule.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/28020906688.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/vakaf.pdfIn PDF document text
    • http://tcihk.com/userfiles/64477720668.pdfIn PDF document text
    • http://hijoin.hu/editor_up/7328710499.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/04/39468358317.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/48975576359.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/zewekelutero.pdfIn PDF document text
    • http://brukbet.com/user_images/file/malopojikefoguj.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/9e7d91e956e84d8c691cadec55f24898/wotalo.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/59280074181.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/punedirenot.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/pegitodonepaperenevetes.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/8944077153.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161316a390393e---turijatuwenemuwi.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/pufuxidoxavagovasofogu.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/pufasevudemo.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/kofilakudagoreb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=free+instagram+followers+turkishPDF 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_off0000e691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 19788 bytes
SHA-256: 6c587e1758361bd124d7f5290a7d22e4d291be0ebbb4754052e2b3ab3dd558bb
font_01_sfnt_off00011a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13281 10916 bytes
SHA-256: 18238c2cd34a7765e4230cd0fce7ec92ffa5c02517f906c27095427fe6badac5

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