Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc56fb17f99b12c7…

MALICIOUS

PDF

86.3 KB Created: 2021-09-06 17:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 75b8340eb14ecf58d0f615067ae65a2b SHA-1: aa9821a1650e1a25b7ece59e269fb2e9f226789a SHA-256: bc56fb17f99b12c71618ef36c24f344318e7c2fab1a8092d78c10e63d24c906b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/0e711ce0cad42e6447bdf7c5c0cf2b70/21329111626.pdf In PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aabe83cdbc---pakeriselepefaga.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/5c18f98ec94f9d60e1dd6030b0c39588/nupuribol.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/zunovidukari.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/ef3343c807244560396e4e4718ba23d3/daliv.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/84040979543.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7d3593fa7---1661541021.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f35fd32e03---40762009329.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/62619769165.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/jijagozukud.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/pusekesetuk.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825202db674---38118709891.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/9407161.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086323324a12---sogemibiwijatujawoliga.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf8633d15---42824858032.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/14368116021.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d9714160411---wazexe.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d08fcbab201---11877211044.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/7a33ef3a3b4fb11ca8f5cf888ef71988/61655107654.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/23664809919.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/9lb0qla4a1atl8hioav5ph11i4/repoduzewesajevetinolexuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=principle+of+nmr+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_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 10356 bytes
SHA-256: 6d7b2ddfdd1c079f8b5e6e0034c7ca1a6f56da46ef5c060c147fab70ea6b8c1b
font_01_sfnt_off000103d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 18652 bytes
SHA-256: 2bc84eeef09bfc82ff362874a2e2045137fa423d52027a912ba1e7f2fd1d0639
font_02_sfnt_off000133df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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