Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8a44a98d4d2aed…

MALICIOUS

PDF

85.5 KB Created: 2021-09-13 00:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 60ff18c2b761363c8db79831d5cc4d43 SHA-1: f80091401b8d65a6133105f878152b6d4159cb6c SHA-256: dc8a44a98d4d2aed93a6f0963bbb46153d8a6f63a439ec7e5dc6193e5dcc320f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=how+to+check+recently+opened+apps+on+android PDF link annotation
    • https://vientangluc.com/upload/files/4204849495.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/f8be6631817537f6266debb28f7e9630/nagulijaxe.pdfIn PDF document text
    • https://kaparatt.com/images/File/bavumovoki.pdfIn PDF document text
    • https://adikkedua.com/contents/files/25999933648.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386c3a36238---wobopeda.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/97824547364.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/51546122977.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/bepokalip.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/wolekunoniw.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/75044811245.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/busekobebibozobalifonoteb.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/52074418500.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///60877241358.pdfIn PDF document text
    • https://thietbigas.net/media/files/dusepisifesufobuba.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/2648840794.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/sirigo.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/97789767374.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/16521679214.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/mikave.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f81e607f47---kazedirosofonaxuwune.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/popub.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/xukuwime.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/91997079241.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/32228118576.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/11905882620.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_off0000e882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE882 17672 bytes
SHA-256: 391efdf8e0397a225f3859deee9d729297fb6715cf4e53f7f5fc6eeb1f3d3aad
font_01_sfnt_off00011671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11671 10892 bytes
SHA-256: bd3ae7cc791a7af2efbc1e7f462b1cfe0956ab86a90d5ca795eb767d91c19d8a
font_02_sfnt_off00012f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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