Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eddcf76096820a4…

MALICIOUS

PDF

75.5 KB Created: 2021-09-04 01:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a2dca2a6dff3fcae98993f03eaac0d6a SHA-1: b5d73aa7e480c6e9340ae2468a540f41837eac22 SHA-256: 7eddcf76096820a46bf3a2e0c8bec46272c09f80e7f134c3a60413ae4476a4ed
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, presenting numerous URLs that point to potentially compromised or disposable hosting, aiming to lure users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://wolfroccatiassociati.it/userfiles/files/58879304123.pdf In PDF document text
    • http://augustaelectricalwork.com/editorData/file/99455825021.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/fodutav.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e54e410d43---mabopiranowu.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/46765161445.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/rezabejanu.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/metotedisetude.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/lajibivugo.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/irs8k0q5j6a30c7dqk3dea2hv0/xuluko.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5d1db79d074978c0dc019ea504a1d043/nozerokuwimibatu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cc0be59fb---sogogoweboxaketanesopawo.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/razenamagoroginifedobaru.pdfIn PDF document text
    • http://dyweisheng.com/uploadfile/file/2021081404002673499.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/mopewujup.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/kesudokakugapuzile.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/birezi.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160acda469f78e---15674572793.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/81674133059.pdfIn PDF document text
    • http://cwesp.biz/upload/file/bifekaluboxibuxaje.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/54747636023.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/fuwofuzozixi.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/wojejixajina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=proform+6.0+ce+elliptical+manualPDF 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_off0000c255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC255 17496 bytes
SHA-256: 7db777ec2a4945a1eeea1a715f8c48a6ffc275ca67139863b37d986e43bf5d04
font_01_sfnt_off0000ef3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10751 10928 bytes
SHA-256: 98d7f009eb707f6f9b77c9fffca95c9914fb779996178c544fd9eb90c69398f3