Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25c98d5dfeabbbf…

MALICIOUS

PDF

87.8 KB Created: 2021-07-08 18:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01ddbe6edc48a4461a7f21dffef22e56 SHA-1: 1f14eac29b8d59048cd4d97cf2c51aed0aa9ad0b SHA-256: a25c98d5dfeabbbf699e1518461d4b9a6bf05f16059cfa71b477ebe41b930570
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 of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://rasathantrananotech.com/ckfinder/userfiles/files/9120789784.pdf In PDF document text
    • https://giga-tronics.com/userfiles/files/81646843693.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b997cae321---fokiguvi.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/3370276114.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210602_EE1484FD82933334.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/maxifaxi.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/furakoviboxodepumiz.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b9fb2a9a3---rewiwimijen.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/b663ffbc2e260ec3027bd71431db3066/75380895501.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9e565cdb9e9d7308cf87b957f521a7f8/92203325205.pdfIn PDF document text
    • https://lemanssrl.it/file/69261538099.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c32b2c380d2---83687789804.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/f972a167c1c8e57d9967960621bac472/54237001094.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106181646.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/41722342473.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/66398796367.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/80983716811.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/lenesudisibolawojamonogu.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/1a1707475d752250e7554541f32edbfb/23161955900.pdfIn PDF document text
    • http://safetypath.net/cms_images/bidusofomowewuxalunuw.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/verarubororuga.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f5bbcf479---30086490320.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/4ed84b295405b93694043e895a7a6e43/49374227524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=accounting+for+investments+gaapPDF 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_off0000f400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 17032 bytes
SHA-256: 7d4c38381221113e6126dee02cac1356d6a17aa484df52c29d6782552eced4fe
font_01_sfnt_off00012097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12097 10924 bytes
SHA-256: a156c27bfd1592ef3bef88fd640256aeaefa2a5461ef90fada501bf83f012df1
font_02_sfnt_off00013a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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