Malicious PDF — malware analysis report

Static analysis result for SHA-256 1573845b0a6c76fd…

MALICIOUS

PDF

91.8 KB Created: 2021-07-20 02:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b21b0c606776287e11645cb57156cba SHA-1: bc3a08e1063df5082e39df74c5fec1dfeae36aa4 SHA-256: 1573845b0a6c76fd9a6e8aff0d792227862d4ee2c2cd88c69f17dc2fe87be7c5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The document's structure and the nature of the linked URLs strongly indicate it's part of a larger malicious operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f03b8740d---93636124984.pdf In PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/cb4eb75cd7c688b33630ed7f4fe7faa8/moremupamade.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ecc1a50625a9b22e7ec952e000ce1bc9/zepavetenisigo.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/cf364vnmrcjj1tpqf0l31g2ri4/mulotonanuj.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/91964442649.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/9753f26983fd5a54b3eb95f6d947fcfd/vaxavadasikedeva.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/fumapafanajeriwufozo.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/18240507015.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/52fb64e0c0a28d1c6c5c323fab8a743f/94554341832.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6be97512---zuzezusorom.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/4cea387c7c33a6a60afd3dafb443dd3a/16242692300.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/vuzotikebifenekazibunak.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/25286819125.pdfIn PDF document text
    • https://computerzone.pk/file/bidabisir.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b39c9c3618---74352591547.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607344790824f---tobigadiwokoxirifima.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c178174ba67---45042281469.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/41502277085.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a077aaa8---12643877180.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609859dbc5fc6---rodelomegulapuwugal.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/23866604158.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5aa472545f---jifejuduwajoravis.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/deef17d669f5f357bbe249acd5c697fc/nugeteropiwowas.pdfIn PDF document text
    • https://tckontrola.hr/files/36266824025.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/sanofosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=places+to+visit+in+breckenridgePDF 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_off000105d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D2 16656 bytes
SHA-256: a41ef22157f97f152fe36efa7826ba454cee7b0da9b42528823aa3d9b1dd0677
font_01_sfnt_off000130d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148EE 10844 bytes
SHA-256: 3e2b75e80ad95fd9965a7412d3f83475fdd176680be75d810b8da8d5018234e2