Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b97a1e5cbc7cb6e…

MALICIOUS

PDF

69.8 KB Created: 2021-10-01 11:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e4c33a2601d13df93e489ef568aed3d1 SHA-1: ade1c2c3dc241b459636f4b9a985ccdbb90af1f1 SHA-256: 9b97a1e5cbc7cb6e73c00af0294e331dd7f3bd019e5956af0b5731bd15fb31b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. It also functions as a link farm, directing users to multiple compromised websites, including one hosted on a compromised WordPress upload directory. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://myatkinsonfamily.com/userimages/34662973327.pdf In PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16144cdc1b3841---14030571844.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161328b1ff337c---38318167719.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/wudugamutuzutog.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/46929088063.pdfIn PDF document text
    • https://rajakedua.com/contents/files/30524929849.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/59461788272.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/jibesanamajitej.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/40665028270.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/lofinemasufimebujodobo.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/26820602406.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/lobogowukelebekedope.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/60260722220.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/2aa145571883397dce6d774344eae13f/33866095017.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/41161063476.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/363cb62275336a9bd0c77fce7c128cb1/sazezuzipixewababisiba.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/15422890898.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/divudirapagobukajum.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/4313624684.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/78382085705.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/7873756494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+turn+off+auto+spell+in+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_off0000affe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFE 15948 bytes
SHA-256: ddf1620fc2b8775b28e387c2f6be8379b136ac1c9f66571916882987d952b62c
font_01_sfnt_off0000d8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 10668 bytes
SHA-256: 26fb4d7c90780c9e1a0f163608f55ce5a83f87bd8b0a11efc17861dd9c6c8999