Malicious PDF — malware analysis report

Static analysis result for SHA-256 856e0f572550661d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 09:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a510a715a6ae92398513455bddee401 SHA-1: 8b14c5fef38f4fcbb7752406f5af7f5703cc09aa SHA-256: 856e0f572550661deb099a877b8cdb3dc061c58a3ab78eb43c735a6a768204c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as a distribution mechanism for phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/o4a4bdcv915009envjr23ma3f7/76674319764.pdf In PDF document text
    • http://cheapmarkt.com/userfiles/file/rimosele.pdfIn PDF document text
    • http://plncse.hu/php_data/file/73241251434.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/38357863901.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/764e607451eab188a0579eb7d98f9b21/waruwu.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/lomikujumodulepizopi.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/povoretax.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/fc9707cb1c318c39b8a07e54d24a7ee8/50100819837.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61dad1831d---20394791871.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/26345824841.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/4ir0s9h63i4god34b4hsn2p8i2/57548620851.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/pajabovun.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acb8d06792---57138229775.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gotoxek.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/napava.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/nqinoo5egtt19nnqkh5tjoltsi/65527572233.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/nafaboloto.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/wurolimewasiwetodasageg.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/turapina.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/42718142993.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/49372439967.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161048bdbb9de6---18039316750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=hsc+bm+all+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB85 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000d37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37D 20464 bytes
SHA-256: 0b1a5043f25c1b4d4ba63815a37215269aea716d298befb1f6929200ac101cf3
font_02_sfnt_off00010806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10806 10480 bytes
SHA-256: f7661cbde0a07c5ccbc8fdeb02c5a6f6e941cf5827212d7ca98cbe7ee7310f59
font_03_sfnt_off00011f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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