Malicious PDF — malware analysis report

Static analysis result for SHA-256 63027edd2836ffad…

MALICIOUS

PDF

74.2 KB Created: 2021-09-01 17:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8886a9d942d3966377f9d55b0ff2a294 SHA-1: a7b229c2e340c3927887e2d25e2bb39e1d9026a7 SHA-256: 63027edd2836ffade20416b31aa1c647751425966d5addba62cccc4bd6a0229b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the nature of the link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://jiuxingchaoshi.com/uploads/file/291654144050.pdf In PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/gewiturolofexizopovako.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d26de0d19d3c9debbcd3e16133582448/51656231472.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160828b7e2abf2---36597005029.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9fe493fe8---ginowo.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a50a860d1d4---73720199962.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/99833229560.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a591527335---54248921683.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cc522fc64---10685952586.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/vijatebet.pdfIn PDF document text
    • http://uci.ir/userfiles/file/fetomasodijeji.pdfIn PDF document text
    • https://digireg.si/upload/mugatexexulinakiwovim.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/m816hdugg8dl72lrrpc61355ao/begiba.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/54605699465.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/kelonuporopifis.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210828_9E724B3275C6811C.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/70586676648.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c4669abed67---kosoniwazogolazubazevuf.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d85ee30ce4---buxofojowenonuwalu.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/kifugen.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1611ebba6275a0---basizizumit.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/bunovagapexojakaforijufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+get+nick+fury+in+marvel+strike+forcePDF 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_off0000bf36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF36 16252 bytes
SHA-256: 6213839b2bfee712a2c9ed682a906b5a9ea6891d2155253ef6ba77ee18d53318
font_01_sfnt_off0000e91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91E 11128 bytes
SHA-256: fce341dca87941ff5ae762d142c6cda87e555367660eca0856da810577f60ba3
font_02_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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