Malicious PDF — malware analysis report

Static analysis result for SHA-256 2081dcc18e1e1371…

MALICIOUS

PDF

114.8 KB Created: 2021-08-07 13:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a1bcabbfdeb6a865b7e740526fdf49c4 SHA-1: fa91d88519e00a31f8bbf7f2f17e71c39443196d SHA-256: 2081dcc18e1e1371c1af3c73b320e780abb5c44a8153d33226f5d5e2ce0c83b2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable domains. The presence of these links suggests an attempt to lure users to malicious sites for phishing or to download further malware, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/6abt1q6dt86mpfjjvand21s1mk/mazawiriziwanapetomi.pdf In PDF document text
    • https://giolog.biz/images/bulk_images/files/topafipokasol.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/86084604186.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/66fdefaad15601169bcbc0c4220c5b89/sawijidakerotimib.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/sofagudironotejoritixezaf.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/79343104090.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f6eec0490---17943523374.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/89507798292.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/sipifideko.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/496c30a867ce7ea015a39c803789ce5b/12139953067.pdfIn PDF document text
    • https://stbenedikt.ch/userfiles/files/dirugu.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/54061784220.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/19632973713.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/24440944987.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b4ffc475f---rotavojujekezaju.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/jugixe.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/cda1673e2a40e699dbe42ba4fa5d5644/bonafiviz.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/nakakajuwot.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/e73ace80f26bc6c844ad308e37e32956/92367363889.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a72062ef2af---73850103016.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/77078723474.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ce155a540b1---jodesopuguxukikiror.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/joxamafakezobavimuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=tomtom+start+25+free+lifetime+maps+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000159f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17204 18344 bytes
SHA-256: 4e07a3e07be0936bf31c9d1130f81578e7c1e0247d7d70894bed589c4e409b12
font_02_sfnt_off0001a217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A217 10872 bytes
SHA-256: fddab2c389f79f71bf4bb16687db4e904355609ca08a85f9cb7bd68c404dccfe

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