Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bed7fb9b76ac1e5…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 20:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c53895e9745da2ef0140c0c05c3adc7 SHA-1: 9d78a6e9921cdd84849b0e3f266b7bdb77fbeea3 SHA-256: 8bed7fb9b76ac1e5bf8d4e188ccfaeb3a650940d3dfd321fcb7453c36bd0080c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=simple+happy+birthday+chords PDF link annotation
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae8c51f404---nidegegeripalukad.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/48977605039.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4f1bdd8aa---nitajuwabagukajudoxu.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/69969271051.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/37305064852.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-21/20210921050855907985.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/tasajipumogi.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/68742778007.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161349e2cc10c9---nexinolozafutatin.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/27744673960.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210905023820079.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/nubojirigekepinadeneriva.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/10132284315.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/pixovokajalatebaselu.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/fupafowakulotuwijajamu.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/28969659182.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/burilogubefibibo.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/17537096394.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/95174771612.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/52088040271.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/6703405994.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161310a6e88b08---40641757703.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/tisamapuwuvolenidavu.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_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 11004 bytes
SHA-256: 733f30263c6f49dbaadc9ef204b6ffebce1d434ecfec7c62431593f046b39075
font_02_sfnt_off00010d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D71 18084 bytes
SHA-256: 225aa27608861b020b74fa3c75114ceb32dffd2c972c655c90361d0dd57f323a

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