Malicious PDF — malware analysis report

Static analysis result for SHA-256 578992422663c7a3…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 08:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e498dc64d2079d0e19bbf56532795800 SHA-1: 065e0bf41d8bc20bb88d9f5188fbc38d5f4f17a0 SHA-256: 578992422663c7a3ba778c988ac4c86cb8021c8595a4e0d6c8949ba4909f0857
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external resources, many hosted on disposable domains or compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drironcat.com/images/file/nepukafuxalozijuwekidab.pdf In PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8c1414a72---42036475842.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ddef4d624---33206142004.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/banazoru.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/75148014674.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b49442f14d---xiludijojiras.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/49167889077.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b962360a994---6050892722.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/wuzib.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/942c9s4d5pjh7cdfn58gbir2rk/69497249757.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9628545240---64829686149.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/dfa2fb750b24b7d2e1d44de82a84bca6/gexiwasopowowexoj.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ace593ed---sigisefikazav.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/25858938088.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086edef177e4---kovovuripavurafelo.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764b260cd0d---dojuxoxokegexeruxigegu.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/jexovalupem.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/cf93208afdd79fdab46dab518c6cc4d7/ruzuxafefudonefajido.pdfIn PDF document text
    • http://zae.me/datafiles/file/monisabadazoruroju.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160754e081a2b6---99961693356.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/mefagopesave.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858334d7f79---ribatimibosudoruzesukifo.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/disex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=paper+marble+roller+coaster+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_off0000d214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD214 10728 bytes
SHA-256: f56a2ecd47dc644db2b1760e10964895b3801216bb0ca1f8ad91a690f36ea78a
font_01_sfnt_off0000ea8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 18248 bytes
SHA-256: 86addc2671b80abe30510521a49c1513b1f9340d96b481c02754d31f0308e90a
font_02_sfnt_off00011986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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