Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b9e12527303f4a…

MALICIOUS

PDF

88.4 KB Created: 2021-09-20 13:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0f65614e33dbb734dc0c628bc28a019a SHA-1: 0dc90535b01fc7fd091da1e497a19d859a3cd9ae SHA-256: 15b9e12527303f4adf3e8a03d5e04a99aeecb32d68b7bc9ef8ec8dbca334d502
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the overall structure and URL analysis point to a common tactic of using documents as a lure to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://inwebjor.ru/uplcv?utm_term=latest+version+of+android+11 PDF link annotation
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161371bd6338dd---98768528012.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210914181916.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/83425842898.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/46968658457.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/34743957638.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109130630348797.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/lovifagenexeku.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/sidegemubigubebudupi.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/15349613663.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/xapeweroradamevilazo.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/womejitufos.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/55bcf9f2369ef82e2e7523da9025a636/24944241921.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/busagudapiwebirodeser.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ba7383d6e30c609250f5ab4ca62890ef/92759214654.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/30388142853.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/85428193155.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/97350528843.pdfIn PDF document text
    • http://indemo.pl/Image/files/99552823497.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/rapigeror.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210918_B719AD1A29D47473.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/vonituxuforuzixiroka.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/rupaf.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/68366702745.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_off0000f21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 19400 bytes
SHA-256: 9dbfa0d905db7cc95ec8274f8e7ac574849949cd1c27b78e7449056ac6c76534
font_01_sfnt_off000123e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E3 10376 bytes
SHA-256: 83db84e89dbc1f64f78f3c14eac1c032181b972f4ca20b9c5f8cca776cf1462a
font_02_sfnt_off00013b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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