Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa051d96ba17732…

MALICIOUS

PDF

80.3 KB Created: 2021-06-25 20:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d760caff5ebf95949e146084c4a8cbf8 SHA-1: 1ac4f56a9fe03e443de5c5624d97b3c71e54e653 SHA-256: 1fa051d96ba17732e1e5ae64f488240a405fd535beb9feef8242797320edd9ea
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, suggesting an attempt to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://infrive.ru/uplcv?utm_term=the+odyssey+pdf+with+line+numbers
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609479ef256e0---wodaxowaxebaloxusapada.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/742e12752126e0d1993115bcec4fa028/35235565475.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16070e2a146c5e---wupodovufigijurisitisip.pdf
    • https://africanresearchcenter.com/userfiles/file/97393209096.pdf
    • https://anthonygillant.com/userfiles/file/75966566086.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/d9sjtsq4ag6fostgjpai9kr0tg/dexorakotobe.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/51a7516cb0974b9b7150e6eb00a96d57/miwomuf.pdf
    • http://www.centralperdana.com/file/zagozevidigopovonabe.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/4d8ecghhqttiv6udh9d0eh5tjk/50145063874.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3d195a00b---dunoluxutefekixaxila.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/jsfjks2ldeq2e8mp16fm7m4v46/sevokebalifenisi.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91ee286618---42159601847.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/39970f5d40ab2eaf2e4d9119b3b61b8f/viregefozixazafogot.pdf
    • https://betenrealestate.com/sites/default/files/file/wogurulovox.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa474dd13b---86107224608.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6f8d37686---10922579616.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbefdbc535---rusovivatapubon.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/0499a0458c89538f06c58d84e46d3c15/59379988422.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a837d309073---sapuwuvipagupuligowejigup.pdf
    • http://www.medicellbank.com/userfiles/files/20348861693.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/f67c9e28d23b40883c8c36a3c7d97057/68017793798.pdf
    • http://sns-russia.ru/userfiles/file/ropolexujapewutinow.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608768a8b1594---88268883098.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/a632116d895a096f8970fdc75d7d5d9a/nagilibexobipazuroxavaz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d563.bin
25f8a17ee6ab419297030c921bc75235f84886fe7f627824d7349de631729844		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD563 16868 bytes
font_01_sfnt_off00010115.bin
13e6bcc92155680a7238230198b2d62a92cd2b4b9b00ad484f17022c28e5ad09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 11004 bytes
font_02_sfnt_off00011a4f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4F 16792 bytes

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