Malicious PDF — malware analysis report

Static analysis result for SHA-256 df0f39e51134af98…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 07:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f0b41a1ad11c8fa50d6ed154d09e2c6 SHA-1: 4a03be81c33280e179251b705b56f89c897088fa SHA-256: df0f39e51134af9820f7ae0a9d562bbad160030f0131114c7b29e7d561e88638
172 Risk Score

Malware Insights

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

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 external links to potentially compromised WordPress uploads and disposable hosting suggests an attempt to deliver a secondary payload or redirect users to malicious content. The heuristic 'SE_DOWNLOAD_BUTTON' further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ifaistos.reality.gr/~triantaf/images/file/jusotojepapolup.pdf In PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210912_F46C4AD8CCB87848.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/bufakujejajanerujolatib.pdfIn PDF document text
    • https://expomediainc.com/upload/file/bisuro.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/fesiwofetusi.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/80354559061.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/39221707080.pdfIn PDF document text
    • http://airfa.it/userfiles/file/51525480874.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/pelipenomufero.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/juweruvivoxiromurar.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/7ace7a826bceb120368baaf48048fb09/14829069762.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/49652663460.pdfIn PDF document text
    • http://dsfly.com/uploads/files/gezogofazujogutinadub.pdfIn PDF document text
    • http://lgassociates.in/uploads/16256259955.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/27391260363.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/57815364a9e42e4b1855d6af1fedfce5/surosadal.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16139b9d69701f---molumezobododo.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/76590757559.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613111f33140c---86430224667.pdfIn PDF document text
    • http://tion.hu/upload/file/53234200447.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/zuxepomesid.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/ralifalera.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/54213377581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=download+baji+appPDF link annotation
    • 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_off0000daf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 10244 bytes
SHA-256: 49d112bf7698282ab00c974da032e8f4673a2339233a3c9c6ac096617c7c0272
font_02_sfnt_off000109d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D6 17124 bytes
SHA-256: 337e553108c7ef4e29762a6d067cbef890399a0d84212d8af67dcb6e4f659151

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