Malicious PDF — malware analysis report

Static analysis result for SHA-256 645b8586ecef5186…

MALICIOUS

PDF

79.3 KB Created: 2021-09-04 10:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d6d46aec1890727649b9aa6aa2f43453 SHA-1: 8f80d24b996867c2c4437d08056eba18e39a38cf SHA-256: 645b8586ecef51866d64047a29d08409e4dcd2fd2c71e327ed5379e202a08062
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to lure users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://banlinhkienlaptop.com/userfiles/file/4531972693.pdf In PDF document text
    • https://kibledergisi.net/resimler/files/bamujurarubukorabiwe.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/56281847480.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/pemos.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/mdseap2tv9urapmopro9m4h9vf/41947958141.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/15238338016.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ead790c5a---lifusojuxiwawed.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/bcdeca6c1b680208d2c3a538ca2f2988/65414964577.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/728432679.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/zifivugoxajigomatokug.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/c63l59qhprne68rsiv5uuc9qtl/75977594318.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/93857135248.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d02040dd---fuvosisu.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/90135888019.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202173174564966.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071986eb1552---dunovaluwufu.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/40473818434.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/melosak.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/8474636973.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f9553fef5---70629749401.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/51368965581.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/36200188524.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/72989784004.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/98621284794.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/wexulosubanip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=kalender+2018+bayern+querformat+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_off0000cc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE467 18928 bytes
SHA-256: 96443effdc5b14312ee6af42c977522aee4c08d444d3c0af646e4da09f55c71b
font_02_sfnt_off000114aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AA 11392 bytes
SHA-256: 9dded2fa12db52b80ec35729f988c3c0d230ce38edc58fb592bc9f6a147a141a

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