Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd20426c4ea3c1ce…

MALICIOUS

PDF

82.4 KB Created: 2021-08-09 19:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b04f793e5681b1cc83097f2724353dff SHA-1: e86131b001515be2e551c148e9e65cd1c422da4b SHA-256: dd20426c4ea3c1ce60bdafd47becc5101d5c0ceec2cd6bc64a8e28bf86a04816
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://aeronautike.com/userfiles/file/25778269550.pdf In PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2129d048e---20192465279.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ad07570ff---43045779869.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd7ec8cba6---82378826980.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/fuwunuxe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c00dcdc892---mudowal.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609350ef25a0b---75795309853.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/wujejumigizaxuximifizepo.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c3b22d8e7---63557810537.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/61488522963.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ukua1oh7qbkljhrf584sef2q84/nilunizumujisux.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202108012356515536.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/11ea07df589a68f8632f30d2a9d4e67b/lipozal.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/1afe0daff7b11b135ef95ca18da1c1f0/vagijesabasexosebanevin.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/17857099739.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/17752773050.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/bf62a6d91851ce0948cc11a6de674eb6/4051776596.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/eili2rrtt9aboau215rhp4cdo1/24097220845.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160984b02916d0---bulekizuti.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/58199279849.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/5mshh9ne4dlhtc4t0qeenqm4kd/falelebodo.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/91a69c7f23c6a76209098a62f570fb03/bipilemezu.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/75946761827.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-29/20210429010734775764.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=introduction+to+logic+gensler+answersPDF 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_off0000de54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE54 16864 bytes
SHA-256: 2a3267d567f72a35f9b70b53771e86a30dade5fcca858d130633c0db7c04caac
font_01_sfnt_off000109db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DB 10680 bytes
SHA-256: bacf817ef1e21c49242660978f0a6de6dbe57aa50f5fb708cf52792f64cfee7f
font_02_sfnt_off00012254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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