Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3dbc0b18d3a2f2…

MALICIOUS

PDF

92.9 KB Created: 2021-09-03 18:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4d5ef547dc022dbcd719a1fffa480b58 SHA-1: 4c31ee4e0ca6190ed4f51c30f771b3365cbaf4ba SHA-256: 2c3dbc0b18d3a2f27d651276d6d2307c889fd0a85b3fdde6b5d2db67916f098c
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to distribute further malicious content. The presence of invoice and download button lures reinforces the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mtecommerce.it/public/news/file/45543618509.pdf In PDF document text
    • http://abimobiliare.pl/pliki/File/lonomogenugatige.pdfIn PDF document text
    • http://polkovnik.su/upload/file/kufegowatuborepomoraj.pdfIn PDF document text
    • https://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/funodufotejeg.pdfIn PDF document text
    • http://normel.org/files/upload/file/fakupubizobufuz.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/dokinalubolile.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/f42f83745e755056946673e5a9ae3025/78619100862.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/5258650672.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f6450da7a---3154981120.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/rikorovikekogibinopixos.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/74881215181.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/n1u7l7od6cvkp3qdp6rq1lafkr/gimexutogewijevebodowo.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/51c6bdc1ff448aa9804d34958fd80d85/67327528847.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/13508343826.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/kapadob.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/faxur.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/dgke0n3n9qg8hics0espau33h5/mejupox.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/lorotisabawojesupaso.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ebl47odvkimvosnv53keuuov55/repinamesofixirobuxuwi.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/a9amktb4uqjjkvg3ci66m5ffgj/90224729222.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/pejukovogivuwetipovam.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/v066c95o0idr3mb4it2fomssa5/79533223482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=bookkeeping+and+accounting+book+pdfPDF 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_off000105e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF4 18056 bytes
SHA-256: cf0471285bc1c1d977f31049d158ff62d160740c9a0062e1b34340fff1eb5b67
font_02_sfnt_off00014d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D14 10864 bytes
SHA-256: 39b1113bcc12ee1b7da30d618dc6042cd7c53a2d2ef0f2e108d56fa515eeec17

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