Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec24df230079a25…

MALICIOUS

PDF

74.0 KB Created: 2021-09-23 05:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de29073a964161cc15203b8a9117c18f SHA-1: e4435e3e33d7d017eb027830f05c270146ae3946 SHA-256: dec24df230079a255c58bb94b6a31fbe890d8e3134f2125f9d5ee88cb90b5676
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the ClamAV detection indicate a malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://cructi.ru/uplcv?utm_term=kamsutra+pustak+bengali+pdf+free+download PDF link annotation
    • http://kondicionery-noginsk.ru/upload_picture/file/36612524870.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/98361689370.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210917035047.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/munamovulufepositidozef.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/kamukisedotaguf.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/12385504921.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/9717m09u43ogaf98mhesimptm2/73871092575.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/vinatinewipipojatidajov.pdfIn PDF document text
    • https://designclarf.it/file/velujasasobirasopuri.pdfIn PDF document text
    • https://fong-cai.com/upload/files/35916685435.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/vesos.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/4741940959.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/xolowedasipivumudidet.pdfIn PDF document text
    • https://austarpharma.com/upload/files/gegigugifufi.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/vopir.pdfIn PDF document text
    • http://ativn.com/upload/file/74433389634.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/eap9i3d2mslc3gcokdjuu9gjph/deragiduwupig.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/degajozikafanegefigilujok.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/71074517529.pdfIn PDF document text
    • http://www.moyekolodin.com/files/63822618168.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161450306ab5fc---94040739407.pdfIn PDF document text
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/wivizasuworirivit.pdfIn PDF document text
    • 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_off0000b951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD163 18296 bytes
SHA-256: abd3fd77238cc203a3dbf36f58e1be6d3e3dc301cdf4616a736e475814896721
font_02_sfnt_off00010045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10045 11248 bytes
SHA-256: 91ffafeed227c8d030dcec2caa0753e6e9a7c3ef35b28872c8496c81e9aaaddf