Malicious PDF — malware analysis report

Static analysis result for SHA-256 eefc7de62c1a5be9…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 19:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 743d3efcafef7ad2db06422888443745 SHA-1: 18cb53aa587532adca46625e19685556d3e4d3b5 SHA-256: eefc7de62c1a5be95b5839d6a8d7ba2cc50531391aabd9912e54f1ad75ce91d4
216 Risk Score

Malware Insights

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

This PDF document contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_URI heuristics and the ML_NYX_PDF_MALICIOUS firing confirm the document's role in directing users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb069577e8c---wadugejemopeduzimewerira.pdf In PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b135b712848---petatiduxudijod.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/87841414472.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/edd1eb55a052a37ed00d99bbbc353862/43134468114.pdfIn PDF document text
    • http://bulmarconsult.com/files/vabawizozuxoja.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160742f75a9fee---tatezugi.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/m3muuvk2doji3ui288ekn8nlp9/suzikawawudeworubu.pdfIn PDF document text
    • http://findusafranchise.com/files/files/16319250980.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/61687658859.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160862ca157db4---losekebizaseza.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210902031717.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6d1393786---gomigiselupofesamib.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff69a910bc---16650823309.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/97769374077.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/52927191699.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/getatuxepixofopix.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/tefinodum.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/41099251877.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/12084530922.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/dexoxofimetigawi.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/70337604687.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/4268351472.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/wideviwinijurumesobi.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e176fad6---lulujewijevixudotunutir.pdfPDF link annotation
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=chemistry+of+life+vocabulary+worksheetPDF 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_off0000d446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 11124 bytes
SHA-256: 639bd3ef4e8f6f800301d237a834cb99803a81c2a0fbe6e7fb64c5dc89068703
font_02_sfnt_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 18684 bytes
SHA-256: 1b17f04f6e0b92b61231ad1876fd132af0fc6f153b999841f166de6c7fc926ca

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