Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e587efb257b9ddf…

MALICIOUS

PDF

105.4 KB Created: 2021-07-14 09:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7ffc85c1176a4ae72e97d0efc10d31ca SHA-1: a7fca43a439eead51b10070f35d7412d7b986863 SHA-256: 7e587efb257b9ddf555bab37eb2b6f87c579322a73183e6eb0e002583a095bfd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f410785416---mododaraf.pdf In PDF document text
    • http://fotocaroli.it/userfiles/files/89075676506.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/1b118c46be1a52e93e168f37dd0fa764/7183045491.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/ca60a0f735eab7959852eac6f6a3a64d/berirudivasisaramunimoko.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/fikazazevilika.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3602942aef---tezaniwofapomefibefojun.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/kgv650e8lvvt1jk59s7elamea4/getometederoregez.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210606111110.pdfIn PDF document text
    • http://zzweien.com/d/files/33290098561.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/45f3ea5dee4aae984e0fcc4d98011e06/20234594021.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/zesiwijoxomaxezugep.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c792809c7---88578228560.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/a249c42b2ac5b26c91e759097e7c58de/49259427869.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/12707244470.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/2056c8efa941c1fad028fa6f3197fb60/54578120780.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a83448bfe1---4957216933.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/v5c03525momcqdgkqh0obptd7f/vorepepudogidoma.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb3bc7f781---65866959550.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/36624929843.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/xivujonarul.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/1hlfipfrnqieq9b2d8ppq978e5/vididofogabipubawi.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/keposiwoxuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=admin+meaning+in+tamilPDF 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_off00013e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15670 16384 bytes
SHA-256: 9194804be610be10eed8365e4a9759e17a53b1b79ef912345567afaa66a2d792
font_02_sfnt_off00018091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18091 10184 bytes
SHA-256: 86e4098198f76578c37abfebc28543004acab29da11dcc7f1caba5016be3a7bc

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