Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8573b101177622…

MALICIOUS

PDF

91.4 KB Created: 2021-07-23 23:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 322cb9e0e15d0f40089645e81f34f044 SHA-1: b5e53864e72fc0482ac3a1edd928ae3d678682ca SHA-256: 4b8573b101177622d26a23678a082b969115ed848d9cde21ef2bfb5993c942c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ab6621896062ba43fe487bdd8b6ca5da/xiwivelipipon.pdf In PDF document text
    • https://unosms.us/userfiles/file/sarudaso.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bbf38a074---bejapivewixawejasamomu.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/9829848435.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075e8ca1d6a9---39680520219.pdfIn PDF document text
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/donopajusegemalajukanig.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/f9939c0fd23adaa53410b1009aaa9a7d/28669016236.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/mazujeda.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/sulobuvaparijavibufada.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/gipubugav.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210605122939.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/dajedizejepekaz.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/23931040682.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/11441675927.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/mlbu1htgi8paqcsbacnargjdu7/53870245904.pdfIn PDF document text
    • http://aimic.com/userfiles/file/63845091047.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/rawugililukawuvuvutusaro.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/e9f876d59e4a78d681e00726e5b1dd3f/pifadaxixo.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c7e48613d---4364675869.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/mudinibivubase.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/radatomozevedu.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/vigizesanemuganiw.pdfIn PDF document text
    • http://kme-kme.cz/files/file/seribiwep.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7cd2a434b---novijadikegarinipim.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9562a13eaa---pemabafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=twilight+saga+midnight+sun+book+release+datePDF 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_off0000ff77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF77 11076 bytes
SHA-256: 074db3348c895773a1a24c4c3c40c5e7496b1102c545abe2ff6166832bd92007
font_01_sfnt_off000118ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EA 17372 bytes
SHA-256: 4abe4ad4f2da093de7a94f2e1b2a5da5a835fac80c7da0258a7e1242aa54ee57
font_02_sfnt_off0001461e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1461E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1