Malicious PDF — malware analysis report

Static analysis result for SHA-256 4848604ec144765e…

MALICIOUS

PDF

76.2 KB Created: 2021-09-08 12:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6b554acf64b892c470ceb42d0b4c71d8 SHA-1: c60535b38310d2cf637984dfd675d0e9c8a978b3 SHA-256: 4848604ec144765ee45eb89e5251de8f9a6ed973f54ee7c5039a2b9dd00d405c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous distinct hosts, many of which are compromised CMS uploads or hosted on disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/t3edk9it0hqceafp8a7na07l56/komazenabezajozorozawos.pdf In PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f524de1afd---ruvebeganivomurel.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/vifuwegonep.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/cf660068556cb7ec7978906ae1d7a03a/semevubavenapemimubi.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/nifarifisidupokos.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/f166gm8dgqfeu7ninf0q83qqv1/jaguruj.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/jokikojuxafigilomenu.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/rupelamudekuvido.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/90150294790.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/76832190388.pdfIn PDF document text
    • http://bscartridge.com/pic/80261705539.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/goxafotugis.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/tupapoxuve.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/24195829713.pdfIn PDF document text
    • http://alltechsro.cz/files/21815977561.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161320e6e2c299---tawufetefi.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/forazamakakusetonaf.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d43b1e455d---wetumakerol.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0212aa926b---japurerub.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161291e9fe7b13---53948661210.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160940b1055901---46689133334.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/susar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=nest+thermostat+user+manual+ukPDF 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_off0000c6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000debb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBB 17224 bytes
SHA-256: 5c5b9b93ccbb4da16dd7acf7ad757d3deb8e00401064b257ba95525f3ab6dae0
font_02_sfnt_off00010b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B63 10448 bytes
SHA-256: 86567ffb6ff9b1d9fa667d9ceb14b28053f5609d4a14154b444f398865952408

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