Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3069b7fe58e89b…

MALICIOUS

PDF

74.5 KB Created: 2021-09-26 23:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5465ff8e12c58091a0dfa94bb97b1fe8 SHA-1: 6bd48a02a6251bc5f4e2f00373f3bb441e253c1b SHA-256: bc3069b7fe58e89b504195fd3e8271aa822c113816e33ae04f0a663d9c905844
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing embedded JavaScript and a significant number of external URIs. Several heuristics indicate that these links form a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0be510982---30003724036.pdf In PDF document text
    • https://egyptsuntours.com/userfiles/files/bepolelipavol.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/do29p8i3982ml3he86obdogofv/patakexonefinalukefega.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ofsh1vevn7a8lr60rkgloobc00/feken.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614540af05ab3---32901523740.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/91591110844.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1612f08f8aecbb---73791021227.pdfIn PDF document text
    • http://gardatrans.com/content/Files/ritatawoluto.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/devisifapadolev.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/8885535840.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/depumopodafosa.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/leluluxofirezeju.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/pikanat.pdfIn PDF document text
    • https://businesslife.com/content/files/bonapipuvebo.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/42442085664.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/dirijuvusekar.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210917104918.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/52978761187.pdfIn PDF document text
    • https://hiroyoung.com/data/files/56443386181.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/42655520205.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/56493261363.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/36971915138.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/c8d13ff8178750f6de31ea9efb4c6fda/91183428439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+stop+message+blocking+on+androidPDF 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_off0000ba76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA76 17880 bytes
SHA-256: b97fc549d02952e7591a095a8695e6c5c5313913571ebb0214e07a4f1059f101
font_01_sfnt_off0000e861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE861 11168 bytes
SHA-256: b0fd3e4952f885de4a652cd6c726e1d382b69621abaea0fde09f336312d79aba
font_02_sfnt_off0001020f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1