Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f1bce8e8ee7bc9…

MALICIOUS

PDF

80.7 KB Created: 2021-07-04 01:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0456060d61d9fdbd43f0f0db7cfacb52 SHA-1: 5bf45b536840a0ac92cd90386cbe2325286f1091 SHA-256: 16f1bce8e8ee7bc9e1244d608b1fadbdb5c961049c7ae0819ee02de653c921be
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or appear to be part of a link farm designed to obscure malicious intent. The ClamAV detection and ML classifier strongly indicate malicious content, likely a phishing or malware distribution lure. No scripts were extracted, but the structure suggests the PDF itself is designed to redirect users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/2tdsdvhqbui8jnrrvpnddvp677/levepixuxake.pdf In PDF document text
    • https://careersourceokaloosawalton.com/files/public/vezaze.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/xuwanivanadu.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/h3pg2imu0oudsdcv3v4p1og7la/nulodopedob.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb41ccd184---17842607184.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8bdb3ee93---bufapegazeletapijofabov.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609564a1247da---41747094626.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/worowofazexazuzaporamufi.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/7914d96e2c9c5868dcd9ec669649e22b/89904672285.pdfIn PDF document text
    • http://jarosi.hu/files/file/kataxutisolidodosaz.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/50eknugrlp5t8mnb510k744qe0/mazogofuk.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48907e829---timububisegomagozobifofe.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/10427532098.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/47780419119.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/gulasidudinuxukapopozub.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081bcc1f1135---86254856676.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/jarekozogok.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/45a28012dd82cfeb82d82558d766a50f/novegusilimewitiludij.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/11771570440.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/bijemurejidulowagusegid.pdfIn PDF document text
    • https://faceless.me/userfiles/files/jalilozed.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/atr3b5s7pn3g4fc23623ck6gs6/xakemasolumatis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=central+idea+and+supporting+detailsPDF 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_off0000d914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD914 16796 bytes
SHA-256: f309cd8fb7ae72a12b2d7a0e1f658213e43fed0be41a4555c7ce2bf9dcb2d4a6
font_01_sfnt_off00010503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10503 10700 bytes
SHA-256: 3ee9e8bf98c9c55f00767699d1589011f969c2231625de3899290e53683558d3
font_02_sfnt_off00011d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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