Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c3f6d945122c25…

MALICIOUS

PDF

88.9 KB Created: 2021-07-18 11:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51aea2a0b71d50dd6ee66bf7f8afb827 SHA-1: 58c86e0cb70d4f17aa763c829b74b1b10655c194 SHA-256: a4c3f6d945122c253ee9cd687cac30cc39f8a97191fc901dd72e9636105314ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb55fec510---15911316894.pdf
    • https://samowar.me/upload/file/rakawutekubu.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/3gh5ivltbsl3rgdo197erisvd3/7381738815.pdf
    • https://bem-sa.com/img/file/82069910916.pdf
    • https://apsco.ly/userfiles/files/85822660532.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954fdecf75d---xegasirezaveguvopado.pdf
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1626422461_8b866cadd1.pdf
    • https://alamansyria.com/userfiles/file/disesa.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/96045889451.pdf
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/064acf6dc8f5ccef72d8e172cae126ee/99078556089.pdf
    • http://baaningdoi.com/file_media/file_image/file/jagalowamasibifopo.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b460ed50d1f---17422206824.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c11461a6f8f---51642671969.pdf
    • http://fra2ange.it/userfiles/files/36187168702.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/db343ebee64faa2e4c02ba5da86ccba9/8368854717.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/57754b849bfd670dfb38e423de14c47d/34822318837.pdf
    • https://elearning-chemistry.ro/userfiles/file/fupagugogu.pdf
    • http://zrdb-drogbud.pl/Upload/file/defufejo.pdf
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/73055869289.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b586cf1ab6524315bccccf6853f81ba/dizajudavonit.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/071494554282f5b530dd2af358a12519/75063404567.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/18f5e8511813bb9b54da3cfe35fa5098/nowakarebebaguduted.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mr+%26+tp+act+1966
    • 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_off0000fcf1.bin
b7a604e5bc9ef2f8d89c5242522fd21d888bb04cee665a11b2cbdd871e8effa2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF1 17516 bytes
font_01_sfnt_off00012abd.bin
96f46a969f809e7c2e3e7bd37533d7649e036d8b236d2120656982bc9e84e4af
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABD 9164 bytes
font_02_sfnt_off00013dcc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCC 16792 bytes