Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec46c8feedcbc56c…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 06:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6eac7ccfb1fce7d3ccad6b24477aa449 SHA-1: 95aa231a2d6052b8008ca401ae7eed2334599f34 SHA-256: ec46c8feedcbc56c692cd388ccd9208477d07dc7b3f83dfff7a6bc228d599988
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of multiple external URIs and the link farm heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://pecsimutargygaleria.hu/files/file/46580466895.pdf In PDF document text
    • http://elisa5888.com/shopadmin/upload/files/60506180182.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/pitovisepifot.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/41365523986.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/wugavatupira.pdfIn PDF document text
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/dukigagumibubuso.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16129c152848a4---mefed.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/mibinesenununukufokili.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/daturubobutuk.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/21928496344.pdfIn PDF document text
    • http://ipceurope.com/assets/file/wegixutodebarupi.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/55215c7c5e7058619a5459c3a6a02190/silorizujarunekapolewig.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070b79461614---62674432540.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/lakagino.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/47746967600.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/libefovixumapa.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/sunevufofoxer.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rikofazofeminenivibesoz.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ed36c89659b---leditewe.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb24fedc10---5337807708.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/43861130797.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d847881cfa---tiwokikekegexiwuvolir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=wily+introscope+monitoring+tool+pdfPDF 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_off0000d42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC42 10908 bytes
SHA-256: 95ed8468881a4552b53f444774eed3e46c585b108990fe2ca0a105706064c417
font_02_sfnt_off0001054c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 17016 bytes
SHA-256: 916089d8dfb3c0e88e3d7528467cbbe2fe18eab8b55154f9719b468dd2bb6f64

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