Malicious PDF — malware analysis report

Static analysis result for SHA-256 a69aeeae15f98dbb…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 17:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f19bcd43dd829957811e5ba3f3e5dbef SHA-1: ad55f5f2ff0afc9376880093447d49cc018f2c77 SHA-256: a69aeeae15f98dbbbc1ef51b4739e440fb51d369679b583d48257104b06e1040
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including a link farm hosted on compromised WordPress uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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://architettoletiziamasciotta.eu/userfiles/files/27382703574.pdf In PDF document text
    • https://ceccarbotosani.ro/userfiles/file/xikuwi.pdfIn PDF document text
    • http://cwesp.biz/upload/file/dasamutufe.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/5353121892.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/47124157449.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/lozegese.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/80670676098.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/pugojafawipubupizuruju.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/tutuzoba.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/wexojageroponu.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136387a993da---zakude.pdfIn PDF document text
    • http://kodemari.info/data/files/40765019665.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/96400777943.pdfIn PDF document text
    • http://sql110.com/pic/92299971455.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/delurowewu.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/sogemagemibezijimiw.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134058da2a64---sosapagafegu.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/78574518718.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/68805879603.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/tetax.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/bowem.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/27247355738.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/mujativu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364b92ebbf8---5903288979.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210907_084820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=operation+game+rules+pdfPDF 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_off0000d823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD823 10968 bytes
SHA-256: f6fa0b3e6f373a8f000f44f68d8184cb425b41d3d12bc8dcd3d00f8b9b822fc7
font_01_sfnt_off0000f15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15E 17372 bytes
SHA-256: 96e67be263eedd3c7e09487d06df119d514507e8e9a139c8f54820e287493ab4
font_02_sfnt_off00011e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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