Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa63acf32fd7ae6…

MALICIOUS

PDF

87.8 KB Created: 2021-09-18 14:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e9efadaa2209d4d120ba999c3abc07d8 SHA-1: be435ddc8378711a5859afb7385e4c93ea4f4f38 SHA-256: 1aa63acf32fd7ae6a139bec49e77a497bab8212118f0f6c6f64a05094128142c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious content. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://olboihorgaszto.hu/editor_up2/63350574840.pdf In PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/zozobijatitubumozebesa.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/vefulikogazuvato.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109050119088179.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/8345702185.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109161231513412.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/xuragivubipufavap.pdfIn PDF document text
    • http://klpa.net/userData/board/file/45592919483.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/sovezi.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/73638506767.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb39a158a---vumagemapemibunimokev.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/makamelukelemajudeluzuxuf.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1d702abc33145ab1c1fcd4f31bb71c5/98957042745.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/96837057185.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/14437300221.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/mixuwa.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/boginexifopaz.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/lexabunokegasato.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/1418722816.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210912_130830.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/70517901174.pdfIn PDF document text
    • http://foodchemsino.com/d/files/zoxupitifuko.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329e0fdf688---poxupekezow.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/23120358484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=android+studio+gsonPDF 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_off0000eda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA7 20572 bytes
SHA-256: 1397c3f1a1f8eaf90af9a5f0e1879962243ac04d0445cfa32c86edd1f64bfa87
font_01_sfnt_off000122fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FA 10164 bytes
SHA-256: 7884e00a72da1c72e896f0159a2e7deaf1c7df03209fe4b7315ab5575c703f25
font_02_sfnt_off000139a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1