Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca96fb87810d386…

MALICIOUS

PDF

75.1 KB Created: 2021-06-25 12:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-07-10
MD5: 0b8e8163fb1e7cda04271ce8cec863cf SHA-1: d5a788f375b8f2b1ded89c83914c1c191ee2de73 SHA-256: 0ca96fb87810d3862b2ab1d93b05b8fb3fd6804d1bdda7d4a7c92b82e780f5ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links, including one with a 'utm_term' parameter suggesting tracking, points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=walter+russell+the+universal+one+pdf PDF link annotation
    • http://murasakijr.com/uploads/files/57887842860.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/96800339793.pdfIn PDF document text
    • http://veribase.com/E/file/95111624521.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ns1d4tiedkcsac675u6ofbbg6o/69733692968.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/5f66452e4adb04548a283fbc5a367605/75586761668.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/fofiwunowipeferamupulodar.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/83578082791.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/9570f4242d9c15a532d37e48939abf5b/senuzisifinumi.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16087b549ec6ba---wodutewiwam.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/071945c4fa94cc10831ef782ae22788a/93935138567.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/0osbooc54mf45t781utq3ai565/3630292545.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/12858885511.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/suzuvosamozisavininabuban.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ag7fm95sk3jvlo0qucf918bd5j/rogebupe.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210519155234.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_off0000c29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29C 10756 bytes
SHA-256: 127b02fc6fb6dd8f14a392d71dd917764645c2e6db42e13ac2cadefec30b0949
font_01_sfnt_off0000db57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 17228 bytes
SHA-256: c4c9f8891d47d685283bb5f4565de30b4e6593f57f2285c76298dc5196336338

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