Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0bad9f4d9c552a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 00:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fb66a5ff573ff01721a1be4315d7419e SHA-1: c5d0e8d29480fe129479d2be2774de793a8cafbe SHA-256: 1c0bad9f4d9c552a211a4d353adda9f5a8b83c0dd6e2a6ab34970a949459c450
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple domains, including one hosted on a compromised CMS upload directory, suggesting an attempt to distribute malicious content or phish for credentials. No scripts were extracted, but the structure and URLs indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://stormester.no/files/file/nixomab.pdf In PDF document text
    • http://edu-family72.ru/content/images/uploads/file/xoxin.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/91659480214.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/xewivekisegiroto.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/829fadcb9419db2961a7595479d94cab/85966947081.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/migukikategun.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/xolas.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/ruginibinadewaxikepinuv.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/bedapefifujexesow.pdfIn PDF document text
    • http://kite-surf.sk/files/44942120535.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff9223f756---4292449975.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/84297465565.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/wuvutejizegevugodadafi.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/48927883449.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/kisogodurukuka.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/razefavofufilolij.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/jotozomezux.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/84727659287.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/95541749289.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/28717451480.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/busugasutamudomigi.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/kutizenemo.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e1ad1b2de---nevog.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138e1e56d903---sowixewasatufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=redmi+7a+android+10+updatePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60C 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
font_01_sfnt_off0000dbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF0 10708 bytes
SHA-256: 70a6aa7f0091665022dea0d2662306f75b3d9a6b0f67973f38e8d9a8e6b531ff
font_02_sfnt_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9E 20472 bytes
SHA-256: 80562e0db178e87ea7a55e101cc7ddddca2b521dbc44de031f3266030f5e5516

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