Malicious PDF — malware analysis report

Static analysis result for SHA-256 73886a984b24fdaa…

MALICIOUS

PDF

75.1 KB Created: 2021-09-13 05:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb88281db71d8488281ef7900de00c21 SHA-1: 11de7c635772ddf9be8cfe32b7bf8f0aa204a414 SHA-256: 73886a984b24fdaadebb01cd453b917208559853538138e8407d2108f02bd821
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF is flagged as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It directs users to external URLs, some hosted on compromised WordPress sites, likely to facilitate the download of a password-protected archive. The document's content and heuristics suggest it's designed to harvest credentials or abuse MFA, a common tactic for credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://garglob.ru/uplcv?utm_term=recovery+mode+password+mac PDF link annotation
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/vowalitudadupiguloxa.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/9701864482.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/l7qknaojtbevopfdb3fubfpg9e/52274544163.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/56407783117.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/16999153954.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/59153647941.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/busilizimobufezub.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/76987012221.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/99899024845.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4df5ad8a0---kuwomesunibiripav.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/renidedenasebalafimewure.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/besoruwix.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/34796414395.pdfIn PDF document text
    • http://watch62.ru/files/files/melokovalirajerugavigel.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/963d97a166c273a8c4f8451b3f2f285c/40388306166.pdfIn PDF document text
    • https://luminex.pl/upload/file/89058473729.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/jarovefer.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/mulugizotutedanogagi.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/6019126629.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/54423842455.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/lupimaleragifavifiwiz.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/36969659017.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/79654828622.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/44781085127.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/janorexadujebubazu.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/xexakufubovikat.pdfIn PDF document text
    • 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_off0000c28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28D 10644 bytes
SHA-256: bd312783122e5ce6dc17c4874e67f5f6a2403b29e43500bceb10f35a04ecc4f8
font_01_sfnt_off0000db07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF319 16852 bytes
SHA-256: 3e69371c054373c3c7376446aa4812da9a8a08d01940aafbb677913894337ef9

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