Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bce3ab96dce70e1…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 04:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2cc2911e95b7cd577281b983e156e9f6 SHA-1: 0f26b9d7579d9ade111c88528a7938dd147d9a3e SHA-256: 4bce3ab96dce70e1bd48f7df5a8da259d03700e3581edf569078143cc70912e3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The presence of multiple links on disposable or compromised hosting suggests a tactic to evade detection and distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784172bbcee---xavegilixuka.pdf In PDF document text
    • http://stlnsk.ru/uploads/file/temodinajozorut.pdfIn PDF document text
    • http://tipiland.net/upload/file/16118056666.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/namivu.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/najitamezexuronagiw.pdfIn PDF document text
    • http://accronline.com/userfiles/file/mixile.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/81456542013.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160701fe4b4a53---xotupimivaletanimovir.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/bepalupinukilegom.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/geler.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/53923959078.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/woboruwaketudipupu.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e4c00144d---dogaj.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c608a61bf8---basidunusunodewuki.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609970b14fae5---89275545794.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3fe85eff45456cc1e38adda47b3a3578/81395757035.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f566e6891cd---pekezusuvilemarafopi.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba03c885c6---moputalabog.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/ditawi.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/zutefevefut.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16111bf0a29b9f---vaduzilatopotomuzuwumodib.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a074b3477---sozinalunaseniserujun.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/faxawo.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c75e7b12d2f9a6c84bb7dc5c495a9914/43804056823.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/kaguxovumutimusibebuzeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=convert+file+pdf+ke+word+di+androidPDF 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_off0000d8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D6 10596 bytes
SHA-256: 8d9581731d7f83d8dbd66eb0244440c4e13208d9757a40dba66d60bd8d3aa6bf
font_01_sfnt_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 17896 bytes
SHA-256: a0403c22d014b4b6f2e92ce095a8ab3b5d38ee3cab24ab992c2a5db8df906ec1
font_02_sfnt_off00011fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1