Malicious PDF — malware analysis report

Static analysis result for SHA-256 c794e7c9048c456e…

MALICIOUS

PDF

73.5 KB Created: 2021-09-19 13:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a664367cfa103f5063b1dc38cb6e0dc7 SHA-1: a20c2d40edc749cfa398451b20d8d760298829e2 SHA-256: c794e7c9048c456ebebe6e52a1dcb482e64a374ef52a6aa56824e7b7ea211105
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to multiple domains, including compromised WordPress sites, suggests an attempt to obscure the final malicious destination and evade detection. The URLs extracted, such as the one containing 'utm_term', indicate a potential phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://pixomot.ru/uplcv?utm_term=cd+cover+maker+app+for+android PDF link annotation
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd1fab2e66---navixege.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/75383225665.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210906124811.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/sazadulemutufosuno.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/43236622468.pdfIn PDF document text
    • http://ministerium.pt/files/38890332951.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/gavudoku.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210907_A5781B5C4D115A92.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613adf1461ef2---xivijojajinikikimag.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/52567863478.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/64681664949.pdfIn PDF document text
    • https://umartravel.com/files/97056932884.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/xotipirijodewoparofojib.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a3015679b.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/gadofanuj.pdfIn PDF document text
    • http://davcpundri.com/css/file/50357345801.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/46c65f901aff14fd71f4ef5b4f035d14/51745568287.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/064c8672e3160c203c755d936ed1d0e7/72144358985.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/25300918099.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/16157303437.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/59952141324.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/zajeselaxabipubanurog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a9d0587fd---99583035869.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/5351758550.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_off0000be9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9B 10660 bytes
SHA-256: d6f485c74882cb84af788c1f5b523260cef8b19f7a1e4a5e3bc91f6507711c72
font_01_sfnt_off0000d703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD703 16268 bytes
SHA-256: 8d9f5244a8fcc1cd58ed728a778df1eeb46046d1249d16939eb835cc8f429bce
font_02_sfnt_off00010043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1