Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef18660f1789341b…

MALICIOUS

PDF

74.3 KB Created: 2021-09-05 11:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e7b507c9deade06acd8bca6d5439ee1f SHA-1: 7c6b389f9e2ca12fa204ae8ba9253a81349df611 SHA-256: ef18660f1789341bc785e318eb7e658be20c96cf8513b10b3592f7e8899e7ca9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs and PDF link farm heuristics strongly suggest an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

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 http://hongshengfish.com/uploadfiles/20210607/210607060128024188z7w70nuj1udx.pdf In PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/vowumedazuwetiferik.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/polarusikimo.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58c98a906d---sadosidewopixak.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/bimuzugojujidituv.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/n4uer6j8ntbd715mt3tvo7059o/35558667028.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/gonogudipopagizebewu.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/pevovujawilaporijiz.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/27893862729.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e5ccf02a6---9462569901.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a6932ede9---61670172775.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807255b642a---86032433873.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/63229990496.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aad533cbd0b---mimis.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/39664404914.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/90952190066.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325fdb92dcc---36201231385.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/9b6f8fb60728b2c166723b7191d21850/tukuvamudiros.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ol3lkjp3vpv7g417kilpke6ttc/xagodazezileroza.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1817f2aa36---71193673683.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/wofanoforuzaweger.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe8fc9cac9---11792068760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ria+250+manual+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_off0000bff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF4 10560 bytes
SHA-256: 2afa60e9c1ab72aa2afcac82881a9327a1168b1a3dd12a34038957234d65f1fd
font_01_sfnt_off0000d7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FC 17220 bytes
SHA-256: d5cf8378919bd22d5c95cde62bcd24f894188296cfc45bd85799af707e4ba97a
font_02_sfnt_off00010465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.