Malicious PDF — malware analysis report

Static analysis result for SHA-256 295a18b57a7cc2cc…

MALICIOUS

PDF

131.0 KB Created: 2021-08-01 23:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: aa53541fa286a599a26a5f2554d6c301 SHA-1: da18c84b12b1bdef6c23ce0b491729ecbdf9a6a4 SHA-256: 295a18b57a7cc2cc16532700e2b2b76e5b3b1c6eae28d3903dedea59fd717573
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The presence of external URI heuristics and the compromised CMS upload link farm finding indicate a likely attempt to lure users to malicious content or phishing sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://brianhaymore.com/images/e/file/73511627536.pdf In PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rababupifamuregugolufimar.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e982bd8c3a9---7451951668.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/femanatobo.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/de9b0fd48e7e113345a147cefeba7e00/66526055022.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852dc14a154---1288653980.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210524220056.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/5a07e56c438c07573acd5eb2d0626a3a/xokakosodenitojugegal.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/xakumarufavozejap.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/63993241649.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922053cdf71---47862844867.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/41461648715.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/pifelelurowelapinudiravaj.pdfIn PDF document text
    • https://mimpidia.com/contents//files/laxovi.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f7240784b---jusonutefaxogilezinu.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/30/file/20210630_121738_151.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb6dfd701f---39328892205.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/63517934326.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/ropoxaj.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/bdce8uibs97p2saio2sv0ten88/31272001057.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/sokipikinugotowopasozal.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b9ba5d309dde10c0746dc92226aabc29/ximov.pdfIn PDF document text
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/debafupapipube.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/41137116c7948239e8d8fd66fd043270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=juan+rulfo+el+llano+en+llamas+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee345fddba8---89291286344.pdfIn PDF document text
    • 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_off00019c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C7F 19160 bytes
SHA-256: 3310e398bbf24b2bd2266c8ae55b62e72287533c3b744ee7eaff6a9a6e75fa4c
font_01_sfnt_off0001cc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E488 10560 bytes
SHA-256: e97d20d7ab16f20c5041dcd760f4c6f7294a55c5c43a0b90818070718505e220

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