Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a4d55c5d593266…

MALICIOUS

PDF

84.7 KB Created: 2021-08-22 07:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad935f4ea06b2968418f57712e53ae80 SHA-1: aa49e214dc61127064540f8ad1e11ed70ccdf61e SHA-256: 90a4d55c5d593266f62c69f3434852907d22f3ce785f573a7185e03c65e2dc08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised CMS upload locations and disposable hosting sites, disguised as a travel itinerary template. The embedded URLs and link farm structure suggest an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://ahsaipu.com/v15/Upload/file/2021512213449441.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/333ca770ebfca63a3434dd001d45ba57/87738531474.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/aeccadf0bbff97ff44c0ae686202764f.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/59900794184.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbd76efe84---95516122662.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/xosanoresix.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/ashnuvqhft62hlc24mam0ofm82/tudonajumenexow.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/rcv2vqhtv9rujjeg5skhe1o8b7/pawuragixi.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/k62jfijb9ifamnqch6j1h9gkm5/87874698642.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/76311332497.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7d6c1bffb---jewobinamadapukekipudozo.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ku878e44istmqtlt9eipo1pgeg/87863834019.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b01dbb92ddd---gurezal.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/82024345980.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/92e12e56194f6502eed773f132311e3a/2877474163.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/dixajiredalibolatel.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/rulededaximi.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a3c9171b4---vusegawogilasebixuxok.pdfIn PDF document text
    • http://homestayhoian.vn/uploads/image/files/bagesefux.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160895e808b107---24609561979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=travel+itinerary+template+docPDF 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_off0000e8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E1 16928 bytes
SHA-256: 5cf7d52062989b582a3b9808e2d478a1d6e3c336a6142674e6066c77d53a17a8
font_01_sfnt_off000114f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F5 10648 bytes
SHA-256: 5144432893984c4506e8e572ab24d02cb6c94bb2f1d5f138682b4c40d9485b40
font_02_sfnt_off00012d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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