Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a297fca3cab50e…

MALICIOUS

PDF

70.7 KB Created: 2021-09-11 16:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd35cda620782c56ca406c429ab1a4b3 SHA-1: 8ccce31cb3b0b5cb2a18c4784d20f023826cd53e SHA-256: 68a297fca3cab50ec7012fe39b4a4c931ec980f8dda2c552e5d940e24999ab4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces this assessment. No scripts were extracted, but the overall structure points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://luatsuavina.com/userfiles/file/4464809799.pdf In PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/sotanisafemurikexowene.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/pezavofavinulirapuresef.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/88256973068.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea67d7b5ab---75274200.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/kuximelunovixotajitij.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138573bbacf8.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613675ee7c97a---xonanupodemubevege.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/rajafavatazeji.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/wadukowuxutipegefolil.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/fenivurixe.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/fapizafirixu.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/14664310006.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/zegogigejebizemabovev.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/turonuvese.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/66599995371.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/wobomowenimanof.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/litakine.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/92363060780.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/xavevoxonewelefobabifage.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/31597035782.pdfIn PDF document text
    • http://synergyproperty.com/images/files/87470064611.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/ludazazomukefoxotulexi.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/54625517249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=lost+google+search+bar+on+androidPDF 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_off0000b599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB599 10744 bytes
SHA-256: 756d7ca748d89f64decb6b72c19675b3afbd1b690fff9687fe98ac45056791d6
font_01_sfnt_off0000ce06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 15600 bytes
SHA-256: d2294ba6e42472a9dbea0d59caba9a3e650cebed178f02d04df517dfca7a30ed

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