Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71a0d4f823275e6…

MALICIOUS

PDF

75.3 KB Created: 2021-09-11 12:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ef1e4c5578d55ff13b2638995d8e86ea SHA-1: fcf538edd7605baa7cc38e3a8031f0dc6ad8d9e9 SHA-256: f71a0d4f823275e652485799336a84b77dcda44c134ac3fdd8aecd88eda9b742
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF-specific heuristics related to URI and link farms supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=jake+snyder+justice+league PDF link annotation
    • http://sntaviator.ru/ckfinder/userfiles/files/8206306550.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/kagoremolexipudapuroruxis.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/mijonijavega.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/83430573434.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/nogodibadokejipimeket.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210901231904_1970155455.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/98438640965.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/bozalomig.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/31470208998.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/3214202325.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/52878164198.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/gedelegiwerafadunonapepar.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/muxipasiroxudaxaboteko.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/53711809078.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-11-14-45-38-6kKozSIJ.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326b80506b0---kenilimuputimolorujosil.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/polipegisibunufawivosepis.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/54270771102.pdfIn PDF document text
    • https://lesura.net/userfiles/file/86166648545.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130745a2fefe---wubiwoku.pdfIn PDF document text
    • http://scantech3d.com/files/17854725581.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/91052626080.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/b02627iod5nrr8nc1h6n4cmq6t/revibi.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/03c76e28dfcf37f3b6834f7eba0660ad/76102755393.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_off0000c0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EB 17672 bytes
SHA-256: c3465bca9f314c35a6961dbf07326864d93c588eb8b3bad9c986d0484cb33b2f
font_02_sfnt_off00010676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 10852 bytes
SHA-256: 34554e4e00a76ee83dd278a83650d51ec0991d54c03c065abce9749b21a97918

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