Malicious PDF — malware analysis report

Static analysis result for SHA-256 8511bb30a797d802…

MALICIOUS

PDF

69.5 KB Created: 2021-10-04 04:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3de39773ad3db26c558bcf4e987aad28 SHA-1: 0a9f0b48c8daa8c6771c7c5eece27bdddfaf3285 SHA-256: 8511bb30a797d80244536794e56f58fb8cfc3e806d9c7d3525bc96347cc26da0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, including those hosted on compromised WordPress sites, suggests an attempt to redirect users to malicious or phishing content. The file's structure as a link farm further supports this, aiming to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=mary+oliver+swan+poem PDF link annotation
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cbcc7e5d57---xikalogaluvekakuvitaroz.pdfIn PDF document text
    • https://geniodelweb.com/file/58333108590.pdfIn PDF document text
    • https://fq.ua/images/file/46221731504.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/dilamek.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/48573486521.pdfIn PDF document text
    • http://3m18.com/images/editor/files/22051605463.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/dobakabowafateme.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/67451988597.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/27856746284.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/vigixenudokiganinimewotob.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021092618280061980.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161581ba600c22---wepekaporarolewunojizumas.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/55598183465.pdfIn PDF document text
    • http://ttc-investco.com/img/files/purekiwazatipuvevifuf.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1da4a033f---dunaz.pdfIn PDF document text
    • https://glozor.com/userfiles/file/79275570736.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-01-04-14-24-80.pdfIn PDF document text
    • http://tiquital.com/documentos/file/3564768330.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/numikibopijibuvisowopam.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/pifomokurevaj.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/wowowizixivutivekixono.pdfIn PDF document text
    • http://labotinnghia.com/img/files/bumepejemidupirupokad.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/11991192630.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/30054092020.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_off0000aeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB3 16580 bytes
SHA-256: 93b7a7873319e65f2209707bce1bb66641675d27ac158eb57c79b0070ebf20ff
font_01_sfnt_off0000d86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 10576 bytes
SHA-256: d105b60dbe2b6bbdbe2157c90504b71a030268ac2897a2a7c1581883332f237f

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