Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a300e6890ecf5e2…

MALICIOUS

PDF

72.4 KB Created: 2021-09-10 20:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7307703056cd4e711b568252fd350efb SHA-1: d23b3b6c5ecfbce676478e35b0d8719fc9d754e1 SHA-256: 6a300e6890ecf5e24c76676581549088a1b91a8757969fa169fb0a3fdff7588d
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to various external URLs, some of which are hosted on compromised WordPress sites. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://ngor2-3.com/file_media/file_image/file/88357270723.pdf In PDF document text
    • http://shannonlakeestates.org/fck_images/file/jinezamagenuvi.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/98282615557.pdfIn PDF document text
    • http://schokobrunnen.com/idata/nutuwadapuxitivul.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/26854083549.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135233cea1a7---kozifekeloga.pdfIn PDF document text
    • https://hotelcorona.ro/files/1684795248.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/ranevomarurixudezeb.pdfIn PDF document text
    • https://rafautama.com/uploads/file/47746797347.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/kobazabudusigoga.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/navivikipebokuk.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210906135829.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/nivesivegozurakomutotij.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/kafilagimejip.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/vinukazufitokepufes.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/didibepuputulipaxilurowe.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/59722701360.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/wifipekimag.pdfIn PDF document text
    • http://gyliver.ru/files/files/gavivib.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161354a10e5d69---nitekarabadava.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/68008925873.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/pawawomujazaxavaledibu.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613037bdb1a2f---walumifimilinedate.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/55722878827.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/11989730108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ppsspp+windows+downloadPDF 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_off0000bc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC74 16092 bytes
SHA-256: 9d641902abcd6488718c6fb40cdf492bf04e0f3c0ab7bf1ccf3e95124bcc2842
font_01_sfnt_off0000e570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 10144 bytes
SHA-256: b79bd2c0c77efe47ee39917e0af31fff4521f56fee0c4aef21aec129f598caff