Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f910399ab77964…

MALICIOUS

PDF

88.1 KB Created: 2021-09-03 18:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 538a23d7fd7386028800a8b5c962a39f SHA-1: 7931c9861fbc7b2334297b117d9dffbfed219adb SHA-256: 18f910399ab7796421764123ca1dd434b0704dcd569b60af5b72a6d7fc8f2785
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised CMS upload directories. The primary attack pattern involves luring users to click these links, potentially leading to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://vuonlan.vn/data/upload/files/28512229813.pdf In PDF document text
    • http://fresh-j.info/images/uploadedimages/file/75233665182.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610b099a03a0d---mukarusujegominojusopase.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/576933703.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f82588a81b---45242296729.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/wibonala.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d1ca9a1cd---fimoxugizo.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/14242695014.pdfIn PDF document text
    • https://promise-land.com/upload/file/65436192111.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c274792eca1---58257777511.pdfIn PDF document text
    • http://burchiellati.com./file_fck/file/gejotezilafet.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858e86de4c9---xetemulid.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/12590216660.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/1fc49887624ea988dd0a3170b21e6838/sesusijivuvatefezewogetix.pdfIn PDF document text
    • https://aneri12.eu/res/file/danakumimunebofulejewisek.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/tizumetijukiguzaviji.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/4c27cf8f139bf92f2ebb116099146687/wovetozevuxovidid.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/64e8d461d577b83c8f74a0da88680d85/nevumimubaxebaligijigupu.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/lubisa.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8e6b5e2c757aeeb7b38538728d140ef3/likudoxasufuwuzizutojas.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/b7r4db1o54q1et7g77tbi16jl4/2665579655.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/756e57a80fba85d9a90213a8d7f49594/80969486565.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/851af22a025c9accd6312ac13ed7c251/7326580489.pdfIn PDF document text
    • https://soechi.id/userfiles/file/kegadevixupebe.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/5v0hmjccn0hb601dj5rsl183g7/34030835365.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/80200dfb765c0b0c1bcd0fab9298ae66/bokenuvamebupiwivukevega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=regional+science+high+school+entrance+exam+reviewer+pdfPDF 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_off0000ed97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 18748 bytes
SHA-256: d6f9797515388243b463cf6c1423c13e409dd546980aeccda9cf46d136bb063d
font_01_sfnt_off00011ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF7 11368 bytes
SHA-256: 8340065d54c582f3ec753d987351c5a2b0730ccb6c3b93250ad7f224758b8cc3
font_02_sfnt_off0001396e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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