Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e1b047c141ea8d…

MALICIOUS

PDF

78.8 KB Created: 2021-09-09 14:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a8f166b9673f4e2aaebd9638b6302888 SHA-1: e230f63a220bae0e120ff65f69bf05ddc0055637 SHA-256: 77e1b047c141ea8d245dc1f277ed6d1fb48538be1e377c7ded537c1f9b1b9c5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites or appear to be part of a link farm. The primary purpose seems to be directing users to potentially malicious or phishing content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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=32+inch+led+orient+price+in+pakistan PDF link annotation
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161311458b2974---36749652011.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/nofolekexux.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/d0246edb94072ed7269d8e2e558a36c0/lubarovevutin.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/gosato.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210901172444.pdfIn PDF document text
    • http://prosquash.by/data/95946139699.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/2882091680.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202192020522069.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38067771614.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/72899067290.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/14668534868.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dc3d589a5---govazipiwafaxuze.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/44008958976.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/58286396852.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/60276473487.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/xajizipopimefavu.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/botivivejemaruxuxo.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613439c2c844c---volonobubawesoxixojobef.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/kuwajujigekemexe.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/sivojokan.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134c17b08107---14522368339.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/94537767289.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/xuwerutinedibowugabokoriz.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/sigexuriguvixumewuzikat.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6484668999.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/35788993674.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_off0000ced1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED1 10900 bytes
SHA-256: ab99e75c6cc8248cd7b13090ccc8977e1b50751b2a01550025ce876b97f0260b
font_01_sfnt_off0000e7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001000a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000A 17548 bytes
SHA-256: f533bd6b51046d9f1f194d296c2615d662fb271acfe0b51d23fe7795d32e40d6

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