Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c3fb15fba4e9dd…

MALICIOUS

PDF

91.3 KB Created: 2021-08-10 08:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8fd35b3598a24a17aa376121ab2b74f2 SHA-1: 3ac7d2d801e44253bec1123a1bca90e0344d0b13 SHA-256: f4c3fb15fba4e9dd88d10941b6a03be930b1a4451a8d2cde944e5760c1164c0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a machine learning classifier and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to numerous external URLs, many hosted on compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an intent to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://phantasos.org/userfiles/file/14311348286.pdf In PDF document text
    • https://oklogistic.lv/upload/file/90415948897.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/juvudukamufagonapuluboli.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/kazatoseba.pdfIn PDF document text
    • http://benetalent.com/upload/files/somaxigowan.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/98282f06fbc05727bf4848799f4b4fca/bufebizem.pdfIn PDF document text
    • http://khocabien.com/uploads/files/90394099831.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/74fa43e86c92cad5206530b133a3232c/97735552276.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/kejilefumimevit.pdfIn PDF document text
    • http://adveotec.com/img/file/36059976467.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/8660781173.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/58fdc7317ed7cac50e0120ab768c78b0/xoletoriwarida.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/j51agp9g8jb5qn3cgsdbm2ks7c/vubepapunutiva.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/46850506574.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e73928c8bb---17437319635.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/dipo1eltvek5gmc07da347vbmu/werafukakobanu.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/7981636bfba8f71c8292d3a8cfc915cf/luxanogotijux.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/67f1703c6480d40db4cc2a40bd9c558a/rukamak.pdfIn PDF document text
    • http://3sdent.com/upload/files/taraxo.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5cfda7b58---zevikuzokusolanolulo.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072b9e42333e---tivunoritazige.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/3af9948a6b2c4872163b9c99983af414/tunofenupigemomel.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1a11666211e6a6dd435fcbdce6bd4b6e/mutosedovovi.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/3038228662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+pair+otium+wireless+headphonesPDF 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_off0000febe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBE 10836 bytes
SHA-256: 76c7b592d20d577d2e0dd68d7e7bda887ea14347667971c2510560aa858ab9c5
font_01_sfnt_off00011790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11790 17864 bytes
SHA-256: 5a5584dbb1045a1a9042c8aa0d84b99440cb1d84e7de80a65ff6810a0d0b4f03
font_02_sfnt_off000146c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.