Malicious PDF — malware analysis report

Static analysis result for SHA-256 bedc926538898b6a…

MALICIOUS

PDF

69.3 KB Created: 2021-09-19 07:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bffe9a68d41ee060685e69ec0bebe07a SHA-1: cb719d1cb1e098988b163d26176dde72b1bbce1e SHA-256: bedc926538898b6ad3c8d225bdb43415fa5889764f2a6f4229d785096d9a52fa
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as lures for phishing or to distribute further malware, aligning with spearphishing attachment and malicious link attack patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://medizator.ru/ckfinder/userfiles/files/fereburajebesuludigozug.pdf In PDF document text
    • http://altadirezione-consulting.it/userfiles/files/19132555815.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/15cbdd9cab078c837f0db5fbf4e46d4c/20837053382.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/godafojezitu.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/37566237834.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/26907462469.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/rawiz.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/modosavilexinerabuzoka.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/rimatitumajukajiwemonose.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/74394602269.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/zekigerodijiko.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/duviretemoxul.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/musubasuvubepu.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/68864988239.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/3plq8i3qtj7m95kmvfkmsihk36/30290577287.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613154c6788a1---59321108720.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/rusexoxogubetadutaza.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81664264403.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/36687137532.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad05b11a5---fikuw.pdfIn PDF document text
    • http://krupongs.com/images/file/xogizitagugefuw.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc4be4c65b---88740032984.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134b7866cb04---45286928579.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/95976721988.pdfIn PDF document text
    • http://djpress.pl/Image/files/lidekibomafatowo.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/40896166435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+europe+underdeveloped+africa+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_off0000b32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32E 10588 bytes
SHA-256: 8a58de836ccb2f5fd5cc5bbdece15fca38e3055fd6da1aad5cc729a55c4204fb
font_01_sfnt_off0000cb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE382 14552 bytes
SHA-256: ecd62254d9c336820a603b913bab68ab791f614be1cb6be902e3cbe02dc36189