Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a6c4c201f94435…

MALICIOUS

PDF

93.9 KB Created: 2021-06-25 14:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0698b78add696b0a51367d7b636a5a2a SHA-1: c17e172a97b0d60d4334542a002d73332c907210 SHA-256: 83a6c4c201f944353934c3d7649e1b22ec178fe4b2d502f6a6aa900d34db801d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent. The presence of embedded JavaScript suggests it may be used to exploit vulnerabilities or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f489d4071f3801195ad10788da018ac6/56677205021.pdf In PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/xukifugefikemepujego.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/xijitoged.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b29341a633a---15559514839.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/zerevirinelavogal.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef1327927f---kerokenukijorupafi.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/89172246c4b7fc6e778abd3146143e34/65713883122.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160892ad8c270e---fusamoxebalizej.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16084f0cb19b9d---bimimibedogeko.pdfIn PDF document text
    • https://mytopics.it/uploads/file/bavidonexejitesoro.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ce850f089b1261a51ba85a8e324ad19c/30207155773.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/22184169604.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/25f6325c05c7b4100dbd504c84f5f4a4/26572576480.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/vuxudapelefobakuvoto.pdfIn PDF document text
    • https://yuss.it/file/18905731412.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/2ef4946beea3821ffd57a6edf620a7a0/31113163704.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0205d33c3---kemivotekuvexakitokota.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/66023744741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=caramelized+bell+peppersPDF 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_off00010aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CC 18452 bytes
SHA-256: d5d1d8bdbc1b53a9a2fe2f0c76d2f4e08784c6f46b3d6498b55979f23a76e445
font_02_sfnt_off0001533e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1533E 10464 bytes
SHA-256: afd7fb68e81c419cae6f897c7629a82cb8831e298e5ea3147aaa4d57ab85defc

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