Malicious PDF — malware analysis report

Static analysis result for SHA-256 0396e489139894ac…

MALICIOUS

PDF

75.7 KB Created: 2021-09-04 16:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fdf6e884bd7f257da93a25d7815cecc2 SHA-1: 83b8fadb348b6597d584812b68cd027a323ac3c9 SHA-256: 0396e489139894ac28b46d5cf2ab42360e5f60facd55d77805c0868446bae5d1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://catamma.ru/uplcv?utm_term=a+course+in+electrical+and+electronic+measurements+and+instrumentation+pdf PDF link annotation
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b481e97b5da---93948075668.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/17143577677.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/22673875142.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/36865063936.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/u6aoeg13p92ea4pha2536nid46/rovatiwatukapafivisulano.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/2137919285.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/zipejerefifexejekuzife.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/36230827579.pdfIn PDF document text
    • http://vln.nl/files/file/puputugut.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/12368778313.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607632a655982---17955055660.pdfIn PDF document text
    • http://premsaktidal.in/userfiles/file/lakevokujixewatapoki.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/baguxopexifewipizisekupob.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/jfd0735v16r2f46m3s0t8lui13/nosuzivovatuvupimazoje.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/nupipakofukijatepolokudif.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/39088194201.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161184f6b75de9---netuzafokajafifipeki.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/87kc50lktmt5djge2om5sumnb1/vejodinidunutukobomude.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/28592050154.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/12771446679.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/84813890820.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/71754506651.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/35970847630.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/mukejoguderojedezet.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_off0000c589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA0 10864 bytes
SHA-256: c2692289e1bbdb21a76a378d89c3b272286ffa912511b56f90a09fab4942fb3a
font_02_sfnt_off0000f6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B7 16172 bytes
SHA-256: 3138f9682d1d42436c30137936d406b9097d94ef942332441cef757d2c9b9842

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