Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b621379094c3d0…

MALICIOUS

PDF

83.2 KB Created: 2021-09-04 20:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10c9b873100a514336d3cfdb884d1997 SHA-1: fc8dbe4530a96f81a1013799ae0207c04bf17101 SHA-256: 04b621379094c3d030faa40a45916b424aba1390790ce068dd9a6af55a15a0f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains embedded JavaScript and a large number of external links, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://quick-thailand.com/images/uploads/file/zuduvetusiman.pdf
    • http://hani-bee.com/userfiles/files/selegetizerofakopetad.pdf
    • http://amandatour.ru/js/ckfinder/userfiles/files/2095613635.pdf
    • http://eia-edu.com/userfiles/file/nogek.pdf
    • http://tplustech.com/images/ckeditor/files/tinefagafufawanugolom.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/vigekitefolafez.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2b1121c40---46456895200.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/d7a229488b70407b82c70752b61a2e1f/tuxuru.pdf
    • http://secretinvitation.net/images/files/4472574708.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/s4aev9abfdsdg2887dfk8q57nt/dafoduxiwifimabinu.pdf
    • http://axwelindia.com/uploads/99715282847.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/6d6534e7df6f8743dd4c1c07d3482c77/reteliri.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/4f5fd19df8c73ff3b0e20ac5a26120e6/betorufo.pdf
    • https://centrorevisionimonregalese.it/file/50131165336.pdf
    • https://beaszemin.com/files/85866106950.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a48c133c878---pedubimifer.pdf
    • http://dongzzang.com/userfiles/file///95022449468.pdf
    • http://kythuatviet.vn/uploads/userfiles/file/silalomatoxupibox.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9850178c27---tomovi.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b20833a7560---97736298647.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33aa72dab3---46776469294.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b3a1723c8ef496349a2f32b3024af6fd/95871275716.pdf
    • http://techsystem.gr/data/uploads/ckeditor/files/9845319571.pdf
    • https://careoncall.in/userfiles/files/60027223320.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16084b3bf410b3---99078302317.pdf
    • http://artside.org/data/temp/file/77532369100.pdf
    • https://rajaketiga.com/contents/files/dujarobakuzafa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=msa+high+school+entrance+exam+reviewer+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd8.bin
81d09969d464d2ec0780afc1cd935abeeb01717508f128f633c216d4bbaabb5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD8 17136 bytes
font_01_sfnt_off00010bc9.bin
1a17e7ddefdd9416277e0af9175d7a3f7d60b90a965e065dc321696391bba963
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC9 11316 bytes
font_02_sfnt_off00012619.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12619 16792 bytes