Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d6be32ac21b559…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 22:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eccf9831b812f21027e21284cee03423 SHA-1: 2e39b54f430e5c189ffd90fd4b4a77ebc952abba SHA-256: f5d6be32ac21b559dd5d2e71eca078dceff017220f6dc6a39f87db273acbef51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on potentially compromised or disposable domains, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest an attempt to deliver a malicious payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pasted-radio.de/web/files/suzakokip.pdf In PDF document text
    • http://bet-balance.com/userfiles/file/debajizipanerenejolakeziv.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/fidimisatusij.pdfIn PDF document text
    • http://fruitofthespiritcatering.com/clients/9/9e/9e5e3efd27976f294ade36eaf76108d7/File/wupowopureza.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/jilepivomuwoxusesoxoxare.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/jovonixopatosobasada.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/9e079d17559ca1c5cc7434fa3aecb4a1/lopugananugurubalo.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ddaa2652bd7---11420856670.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/93145858568.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/wabam.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872fa307025---63375744807.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/53094472752.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/33109041155.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/wafajorikasegedorosumixud.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2c212d429---45156258632.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/xuzefadikajuvabutotanoru.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a01e0d0547---xijapabuzojitefuna.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608500316bf7a---jogekojiwisinud.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/83908881409.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/wufegidiwisukorunaxoko.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/nujigamamuf.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/mesazidabevusaxekif.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611c4770cf305---62359409647.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/90813912314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=dwyer+differential+pressure+switch+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_off0000c9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EB 18252 bytes
SHA-256: bfaa7e9c1dc69fa876c70962616ec09cc6046d50dd1ef5ca2fa130da84b0e0eb
font_01_sfnt_off0000f9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C5 11068 bytes
SHA-256: a2add43efdf212fe30c0d3291851ba91d58bacf5ba9bc40014d2eb94eb87ebf3
font_02_sfnt_off0001136a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1