Malicious PDF — malware analysis report

Static analysis result for SHA-256 c656a6b320645a8d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 18:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2948ae9387c867c554f5b23709918edf SHA-1: 2d2f308b4650e073ceefc6b4726584232df739a9 SHA-256: c656a6b320645a8d0a44ab9b816a6b53079e09bdae85424490d728041ee7a2bc
204 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It features numerous links to external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution lure. The presence of embedded JavaScript indicates an attempt to execute code, likely to facilitate the download of a second-stage payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=instagram+download+video+reel PDF link annotation
    • http://ambulatorioveterinariocigliano.com/userfiles/files/robezunenisufazefeb.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/derudo.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/9976821839.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/xupovogarudalolujerenen.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/41936e9a09e21e700bf896325c05ff50/ninerarawukezixiji.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/figazirolotu.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/67461051850.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/sifigituvuda.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/fosekiwigakew.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/relifekanuzuzusid.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/58084324212.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/pakelamupasirivivino.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/lowafutarabixazejiwekak.pdfIn PDF document text
    • https://grancom.by/upload/docs/numizaw.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/pixiz.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/1d63e92f4ca3f74f1097b31360a261a3/24993141645.pdfIn PDF document text
    • http://bluebossa.pl/files/file/87559841939.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5d4e2069---49517223552.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/zisoxijiranuxane.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/98704925660.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/58225665667.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/foditisikaxamo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161386b8267ad4---lomesurowuvikemema.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/xokixudibejusigu.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/mamugifenometoda.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/11747541fbf9859b43123073add3f9ff/wamujo.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_off0000d3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C3 18008 bytes
SHA-256: 10f1c8f4b48463abf60237d6c13921ece5fae611f074db896a2382850e482993
font_01_sfnt_off000101ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EA 10692 bytes
SHA-256: ef22f203f8075a54c768313e8315496464d53a5cd7e1e8535824894fd1ec9843
font_02_sfnt_off00011a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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