Malicious PDF — malware analysis report

Static analysis result for SHA-256 340b4d541a3418a3…

MALICIOUS

PDF

83.6 KB Created: 2021-08-16 02:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 97a7425f01bea1a7ac7b271d3d046bba SHA-1: bc364e36b69812cc7743532e0b6df111b23909cd SHA-256: 340b4d541a3418a31295d499ff8c2b8a0ac8f06d63fc79842a6f01f11f680563
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many hosted on compromised or disposable domains, indicating a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://xn----8sbnbd9chja.xn--p1ai/userfiles/file/rimapaxifimi.pdf In PDF document text
    • http://phelieuviethung.vn/upload/files/83001974057.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/fba92932c130cf424d0907d28a23922b/20692083355.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/xugonatalamokekaxe.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/kuwunere.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/romepam.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/71865712352.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/53370c5a348c6c8957215a2fddcdcd69/xosuwujewe.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ast1ge1114tp88dik0n6hg222o/borom.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/33792176744.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9192802cc---gepuxajuvapodojomi.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3a7a7025e---wumowadomuratenun.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/wirisujesofebazugaz.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/nfvraculrnhi9v1md94jjvrnba/20778497961.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca742515c---jexov.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d58a510eb1---fabikoxovexaferugip.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/31948784508.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/tonivuwo.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/bf20f5a3b936ccfb43d5d0e38735c8d2/41907081537.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdc5890b0e---sazesilukoteximepagedak.pdfIn PDF document text
    • http://bscartridge.com/pic/paduzokusakesigibap.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/55713582860.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/julevapisedisa.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/94260042450.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608183dd62f26---pinepibufirepapuvimufe.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/96393173939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=fox+news+primetimePDF 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_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 10372 bytes
SHA-256: 0c8521351c16c779c5d99c1f35cb10e92ba7ab049abd6dbc77454c48164a71f5
font_01_sfnt_off0000fbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D3 17108 bytes
SHA-256: 725dc88fd6d715d2233b5923c65d2952c18ece11e2571a87ec5562ca42b3e235