Malicious PDF — malware analysis report

Static analysis result for SHA-256 92346a0bfda80dc1…

MALICIOUS

PDF

71.1 KB Created: 2021-09-19 03:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1b579ff3680dcc31f69effaf1a7b9a92 SHA-1: 83c106a60e6e4649fcf630386bdbc824ae82ad68 SHA-256: 92346a0bfda80dc14d595be68e2248a430c60c800e98230f2e4af5094983061a
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to other PDF files, many hosted on domains flagged as disposable or potentially compromised. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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 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://bebsulmare.com/userfiles/files/67129241176.pdf In PDF document text
    • http://gzwep.com/img/file/20219222712.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630972257_6e20ec9d3a.pdfIn PDF document text
    • http://intertravel.hu/_user/file/6638518856.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/dupemokuludedakivuxil.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/52881283701.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/81661846711.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/folexer.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444e24bac58---11180980127.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/86444098510.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/16042996474.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/48575191955.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/kividozidinisi.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136f45391abb---34180011092.pdfIn PDF document text
    • http://12shio2.com/contents/files/tatazarejufib.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/78849636844.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/timokobosugazudifetetox.pdfIn PDF document text
    • http://innersolutions-uk.com/file/46083893607.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/fopenurene.pdfIn PDF document text
    • http://healthywithhart.com/res/file/wunarexibis.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/69adea17cf5f8f2e7169c934328d64ea/mufufepawi.pdfIn PDF document text
    • http://th-hl.com///upload/files/sobafinalesatino.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/sonosorumewekexosojove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mupen64plus+pokemon+snapPDF 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_off0000b381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB381 10552 bytes
SHA-256: 4121fab59af42c18143af157218589a583b340495fb907669918ff6e79a3abdc
font_01_sfnt_off0000cba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA5 15980 bytes
SHA-256: 480747e414c9319ec0a8fda923f6b942a84bf1035e2fc1530b5b85970c38f143
font_02_sfnt_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1